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Worksheets

9SCI LS ES - LI 4

Total questions: 168

Worksheet time: 2hrs 10mins

Name
Class
Date
1.

Which of these functions are the main function of the endocrine system?

a)

To ensure that we take in oxygen through the lungs

b)

To make hormones that control growth and development

c)

To control balance, movement, and coordination

d)

To protect the body from disease caused by pathogens

2.

Which of these functions are the main function of the endocrine system?

a)

To ensure that we take in oxygen through the lungs

b)

To make hormones that control growth and development

c)

To control balance, movement, and coordination

d)

To protect the body from disease caused by pathogens

3.

Release of chemical messengers are called

a)

glands

b)

muscles

c)

hormones

d)

bones

4.

These chemical messengers are synthesized and secreted by various ______________ glands

a)

nervous

b)

endocrine

c)

chemical

d)

circulatory

5.

Glands are ________________.

a)

muscles

b)

bones

c)

organs

d)

blood vessels

6.

What is the function of the thymus?

a)

Help the immune system by training and developing cells

b)

Danger the inmune system

c)

Links nervous system to endocrine system

d)

Regulates blood sugar

7.

 

Insulin is produced by

a)

the liver

b)

the pancreas

c)

the kidneys

d)

the gall bladder

8.

Which one here reduces the amount of glucose in the blood?

a)

Glucagon

b)

Insulin

c)

Glycogen

d)

ADH

9.

A hormone is _____________________.

a)

a chemical substance produced by a gland and carried by the lymph.

b)

an enzyme produced by a gland and carried by the blood.

c)

a chemical substance produced by an organ and carried by the blood.

d)

a chemical substance produced by a gland and carried by the blood.

10.

Does the endocrine system help with the overall health of the human body?

a)

True

b)

False

11.

What is the main function of the endocrine system?

a)

It creates chemicals, or hormones, that are sent around the body to maintain homeostasis.

b)

It creates electrical messages that are sent around the body to maintain homeostasis.

c)

It maintains the correct level of oxygen in the body to maintain homeostasis.

d)

It releases waste from the body to maintain homeostasis.

12.
An organ that produces secretions called hormones is known as a :
a)
chemical
b)
gland
c)
hormone
d)
duct
13.
This gland is located between the lungs behind the sternum and secretes thymosin that helps mature WBC's in our bodies when we are children. 
a)
thyroid
b)
parathyroid
c)
thymus
d)
brain stem
14.
What is gland #3?
a)
Adrenal Gland
b)
Pancreas
c)
Ovaries
d)
Testes
15.
Letter H is pointing to
a)
Thymus
b)
Pancreas
c)
Pituitary
d)
Pineal
16.
Letter I is pointing to
a)
Testes
b)
Oviducts
c)
Ovaries
d)
Adrenals
17.

What structure(s) shown in the picture above the kidneys?

a)

Thyroids

b)

Adrenal glands

c)

Testes

d)

Parathyroids

18.
The "cause" for something to happen is the
a)
response
b)
effect
c)
stimulus
d)
homeostasis
19.
The "effect" of a given stimulus is the...
a)
response
b)
stimulus
c)
cause
d)
result
20.
Negative Feedback Loops:
a)
amplify processes
b)
prevent small changes from getting larger
c)
are initiated during childbirth
d)
are found only in plants
21.
The two types of feedback systems that help organisms maintain homeostasis are:
a)
positive and negative 
b)
receptor and effector
c)
static and dynamic
d)
minor and major
22.

Cells that have receptors for a particular hormone.

a)

gland cells

b)

neurons

c)

hormones

d)

target cells

23.

This structure releases what hormones?

a)

insulin and glucagon

b)

calcitonin and estrogen

c)

Parathyroid hormone and antidiuretic hormone

d)

epinephrine and testosterone

24.

The physiological terms for what is commonly referred to as he 'master gland' is:

a)

adrenal gland.

b)

thyroid gland.

c)

pituitary gland.

d)

hypophysis.

25.

Which gland secretes testosterone?

a)

Adrenal medulla

b)

Anterior pituitary

c)

Pineal

d)

Testicles

26.

Which gland secretes insulin?

a)

Anterior pituitary

b)

Posterior pituitary

c)

Pancreas

d)

Thyroid

27.

Which gland secretes estrogen?

a)

Anterior pituitary

b)

Adrenal medulla

c)

Ovaries

d)

Pineal

28.
What is gland #3?
a)
Adrenal Gland
b)
Pancreas
c)
Ovaries
d)
Testes
29.
This gland is located between the lungs behind the sternum and secretes thymosin that helps mature WBC's in our bodies when we are children. 
a)
thyroid
b)
parathyroid
c)
thymus
d)
brain stem
30.
Letter H is pointing to
a)
Thymus
b)
Pancreas
c)
Pituitary
d)
Pineal
31.
Letter I is pointing to
a)
Testes
b)
Oviducts
c)
Ovaries
d)
Adrenals
32.

What structure(s) shown in the picture above the kidneys?

a)

Thyroids

b)

Adrenal glands

c)

Testes

d)

Parathyroids

33.
The "cause" for something to happen is the
a)
response
b)
effect
c)
stimulus
d)
homeostasis
34.
The "effect" of a given stimulus is the...
a)
response
b)
stimulus
c)
cause
d)
result
35.
Negative Feedback Loops:
a)
amplify processes
b)
prevent small changes from getting larger
c)
are initiated during childbirth
d)
are found only in plants
36.
The two types of feedback systems that help organisms maintain homeostasis are:
a)
positive and negative 
b)
receptor and effector
c)
static and dynamic
d)
minor and major
37.

Cells that have receptors for a particular hormone.

a)

gland cells

b)

neurons

c)

hormones

d)

target cells

38.

Hormones are special chemicals that circulate in the bloodstream

a)

True

b)

False

39.

Nervous tissue is made up of special cells called _______

a)

Axons

b)

Dendrites

c)

Neurons

40.

Nervous tissue is only found in specialised parts of the human body

a)

True

b)

False

41.

Oestrogen is a hormone involved in controlling the reproductive cycles of mammals.

a)

True

b)

False

42.

The sensory organs contain specialised cells that are part of the nervous system

a)

True

b)

False

43.

Only the nervous system controls the functioning of our body

a)

True

b)

False

44.

Nerve cells send message by electrical signals

a)

True

b)

False

45.

Hormones act much more quickly than nerve signals

a)

True

b)

False

46.

Both hormones and nerve cells respond to a specific stimulus

a)

True

b)

False

47.

Adrenaline is a hormone that allows us to respond more quickly to danger

a)

True

b)

False

48.

The stimulus response pathway is

a)

receptor, sensory neuron, motor neuron, connector neuron, effector

b)

receptor, effector, sensory neuron, connector neuron, motor neuron

c)

receptor, sensory neuron, connector neuron, motor neuron, effector

d)

sensory neuron, receptor, connector neuron, effector, motor neuron

49.

The part of the brain that connects to the spinal chord is called the

a)

cerebellum

b)

medulla

c)

pons

d)

cerebrum

50.

The normal human body temperature is

a)

35 °C

b)

37 °C

c)

34 °C

d)

40 °C

51.

What does insulin do?

a)

regulates metabolism

b)

prepares the body for fight or flight

c)

regulates calcium levels

d)

lowers blood sugar levels

52.

What hormone regulates day-night cycles?

a)

thyroxine

b)

calcitonin

c)

thyroid

d)

melatonin

53.

These are chemical substances secreted by endocrine cells.

a)

lipids

b)

cytoplasm

c)

hormones

d)

sugars

54.
What causes puberty to start?
a)
Hormones
b)
Gender
c)
Genetics
d)
Body Size
55.

When a person is in danger or gets scared the hormone that increases your heart rate and level of alertness is

a)

adrenaline.

b)

thyroxin.

c)

follicle-stimulating hormone.

d)

thyroid stimulating hormone.

56.

When a male takes performance enhancing drugs, his body thinks he is making lots of testosterone. Which glands will stop producing testosterone and even shrivel up...possibly never producing testosterone again?

a)

pineal

b)

thyroid

c)

testes

d)

adrenal

57.

If you have trouble sleeping which gland may be the problem?

a)

pineal

b)

thyroid

c)

testes

d)

adrenal

58.

If you have growth problems (too big or too small) which gland may be the problem?

a)

ovaries

b)

pituitary

c)

hypothalamus

d)

adrenal

59.

Which gland is the connection between the nervous system and endocrine system?

a)

pineal

b)

pituitary

c)

hypothalamus

d)

adrenal

60.

Which of the following is NOT a major endocrine gland.

a)

pituitary

b)

hypothalymus

c)

sweat gland

d)

ovaries

e)

pancreas

61.

True or false: Changes caused by hormones are temporary.

a)

True

b)

False

62.

How do hormones get to their target cells?

a)

nerve impulses

b)

floating in the blood stream

c)

electric and chemical signals

d)

respiration

63.

How does a hormone identify its target cell?

a)

protein receptors on the cells surface

b)

it is only sent to its target cell

c)

neurons transmit the hormone signal

d)

glands are the target cell

64.

Can a hormone affect any cell?

a)

Yes, they affect all cells

b)

No, the cell has to have a matching receptor

c)

Maybe

d)

Depends on the situation

65.

A (a)   is a chemical message sent by a gland in the endocrine system.

66.

Which of the following is the function of the endocrine system?

a)

Control all the other body systems

b)

Exchange carbon dioxide and oxygen

c)

Transport nutrients, hormones and wastes through the body

d)

Help the nervous system maintain homeostasis in the body.

67.

What is adrenalin?

a)

A type of vitamin for energy

b)

A natural chemical in your body that provides a rush feeling

c)

A hormone that helps you relax

d)

A type of medication for anxiety

68.

What is adrenalin?

a)

A type of vitamin for energy

b)

A natural chemical in your body that provides a rush feeling

c)

A hormone that helps you relax

d)

A type of medication for anxiety

69.

What triggers the release of adrenalin?

a)

Both good and bad stress

b)

No stress at all

c)

Bad stress only

d)

Good stress only

70.

What happens in the body during an adrenalin rush?

a)

Liver drops sugar into the blood

b)

Senses are dulled

c)

Blood is diverted from muscles

d)

Breathing slows down

71.

What is the side effect of adrenalin causing a sugar dump?

a)

Decreased cholesterol

b)

Increased blood sugar

c)

Increased cholesterol

d)

Decreased blood sugar

72.

What can happen when the body's adrenalin stores are depleted?

a)

Increased immune system

b)

Feeling exhausted

c)

Feeling energized

d)

Increased hunger

73.

When can people experience adrenalin crashes?

a)

After a relaxing vacation

b)

At the beginning of a big project

c)

After a good night's sleep

d)

During a busy day at school or work

74.

What happens to the immune system after coming down from an extended adrenalin high?

a)

It becomes hyperactive

b)

It remains the same

c)

It is lowered

d)

It is boosted

75.

What does adrenalin make the body forget?

a)

Pain

b)

Fatigue

c)

Hunger

d)

Thirst

76.

What can happen once the adrenalin rush is over?

a)

Increased energy levels

b)

Feeling burnt out

c)

Improved focus and concentration

d)

Increased appetite

77.

What is the recommended action after an adrenalin rush?

a)

Ignore the body's signals

b)

Keep pushing yourself

c)

Relax and refuel

d)

Seek more stressful situations

78.
a body system that controls and coordinates all body activities through electric impulses/messages between brain, spinal cord and nerves.
a)
endocrine system 
b)
nervous system
c)
nerve
d)
neuron
79.
If the environment gets cold, we will often shiver in order to:
a)
keep body temperature the same as the external temperature
b)
decrease body temperature
c)
increase body temperature
d)
regulate blood pressure
80.
The "cause" for something to happen is the
a)
response
b)
effect
c)
stimulus
d)
homeostasis
81.
The "effect" of a given stimulus is the...
a)
response
b)
stimulus
c)
cause
d)
result
82.
Negative Feedback Loops:
a)
amplify processes
b)
prevent small changes from getting larger
c)
are initiated during childbirth
d)
are found only in plants
83.
Maintaining body temperature is an example of a:
a)
negative feedback loop
b)
positive feedback loop
84.
When glucose levels in the blood rise, your brain sends a signal to your pancreas. The pancreas releases insulin, which opens channels in cell membranes to allow glucose to enter the cell, lowering blood sugar levels. 
a)
Positive Feedback Response
b)
Negative Feedback Loop 
85.
What is another word that can be used to describe "homeostasis"?
a)
STABLE
b)
EQUAL
c)
COMPLETE
d)
CORRECT
86.
diabetes is a disease that affects your body's ability to produce or use ___.
a)
energy
b)
insulin
c)
oil
87.

The organ responsible for producing insulin is...

a)

Liver

b)

Heart

c)

Pancreas

d)

Gallbladder

88.

This is the name of the simple sugar that is found in your blood?

a)

water

b)

glucose

c)

sodium

d)

sugar

89.

Detects change and sends a message to the control center

a)

receptor

b)

control center

c)

effector

d)

regulation

90.

Homeostasis is the way the body

a)

maintains a stable internal environment

b)

controls blood sugar

c)

controls the brain

d)

controls the endocrine system

91.

The body system that controls the functioning of the glands

a)

endocrine

b)

nervous

c)

blood stream

d)

digestive

92.

Negative feedback is when changes occurring,

a)

return the body to the original condition

b)

return the body to a different condition

c)

make the body feel bad

d)

make the body move

93.

Things in the human body that need to stay the same

a)

Glucose

b)

Temperature

c)

Blood Pressure

d)

All of the above

94.
What type of feedback loop is shown?
a)
Positive
b)
Neutral
c)
Negative
95.
What hormone is produced in the pancreas that raises blood sugar?
a)
Insulin
b)
Glucagon
c)
Ketones
d)
Glucose
96.

Vasoconstriction means the blood vessels

a)

Become narrower

b)

Become wider

c)

Changes color

d)

Are distroyed

97.

When sweat is produced by the sweat glands

a)

The sweat will prevent the heat from escaping the body

b)

The sweat evaporates carrying heat away from the body

c)

The sweat evaporates to create more heat for the body

d)

The sweat makes the skin fresh and good

98.
Homeostasis
a)
allows for a wildly fluctuating internal environment
b)
is impossible in vertebrates
c)
is the maintenance of a relatively stable internal environment and often incorporates a form of feedback regulation
d)
is the maintenance of a relatively stable external environment and often incorporates a form of feedback regulation
99.
a body system that controls and coordinates all body activities through electric impulses/messages between brain, spinal cord and nerves.
a)
endocrine system 
b)
nervous system
c)
nerve
d)
neuron
100.
If the environment gets cold, we will often shiver in order to:
a)
keep body temperature the same as the external temperature
b)
decrease body temperature
c)
increase body temperature
d)
regulate blood pressure
101.
The "cause" for something to happen is the
a)
response
b)
effect
c)
stimulus
d)
homeostasis
102.
The "effect" of a given stimulus is the...
a)
response
b)
stimulus
c)
cause
d)
result
103.
What type of feedback loop is shown?
a)
Positive
b)
Neutral
c)
Negative
104.
Failure to maintain homeostasis could result in:
a)
lack of internal balance
b)
eventual death
c)
difficulty carrying on metabolism 
d)
all three
105.
When glucose levels in the blood rise, your brain sends a signal to your pancreas. The pancreas releases insulin, which opens channels in cell membranes to allow glucose to enter the cell, lowering blood sugar levels. 
a)
Positive Feedback Response
b)
Negative Feedback Loop 
106.
What is another word that can be used to describe "homeostasis"?
a)
STABLE
b)
EQUAL
c)
COMPLETE
d)
CORRECT
107.
As you get dehydrated, your blood becomes thicker and harder to pump. Your kidneys will respond by stopping urine production, sending the water from urine into your bloodstream to thin your blood back to normal level.
a)
Positive Feedback Response
b)
Negative Feedback Loop 
108.
diabetes is a disease that affects your body's ability to produce or use ___.
a)
energy
b)
insulin
c)
oil
109.

The organ responsible for producing insulin is...

a)

Liver

b)

Heart

c)

Pancreas

d)

Gallbladder

110.

This is the name of the simple sugar that is found in your blood?

a)

water

b)

glucose

c)

sodium

d)

sugar

111.

Detects change and sends a message to the control center

a)

receptor

b)

control center

c)

effector

d)

regulation

112.

The body system that controls the functioning of the glands

a)

endocrine

b)

nervous

c)

blood stream

d)

digestive

113.
What is mean by homeostasis?
a)
Controls and coordinates body activities through chemical 
b)
controls and coordinates body activities through electrical impulses
c)
For maintenance of a steady state in the internal environment
d)
remove metabolic waste products from the cel
114.

What hormone is produced in the pancreas that lowers blood sugar?

a)

Insulin

b)

Glucagon

c)

Ketones

d)

Glucose

115.
What is a disease where sufferers cannot control their blood glucose levels?
a)
Diabetes
b)
Influenza
c)
Cholera
d)
Cystic fibrosis
116.

The hormone that makes the liver store sugars is

a)

glucose

b)

glycogen

c)

glucagon

d)

insulin

117.

The liver normally stores blood sugar as

a)

glucose

b)

glycogen

c)

glucagon

d)

fats

118.

High blood sugar levels after a meal usually stimulate

a)

Glucagon release from the liver

b)

Glucagon release from the pancreas

c)

Insulin release from the liver

d)

Insulin release from the pancreas

119.

After a period of fasting the brain makes the pancreas produce

a)

glucose

b)

glycogen

c)

glucagon

d)

insulin

120.

Glycogen is a

a)

hormone

b)

short term protein

c)

sugar stored in the liver

d)

sugar stored in the liver and muscles

121.
When blood glucose level decrease, pancreas secretes glucagon to convert?
a)
glycogen to fatty acid
b)
glycogen to amino acid
c)
glycogen to glucose
d)
glucose to glycogen
122.
Homeostasis in the human body is often maintained by a: 
a)
neutral feedback loop 
b)
solar feedback loop
c)
positive feedback loop
d)
negative feedback loop
123.
a body system that controls growth and homeostasis by secreting hormones from glands.
a)
skeletal system
b)
nervous system
c)
endocrine sytem
d)
integumentary system
124.

Which organ produces insulin?

(a)  

125.

Which organ produces insulin?

(a)  

126.

Insulin causes which organ to remove glucose from the blood?

a)

liver

b)

pancreas

c)

brain

d)

kidneys

127.

What happens to the amount of insulin released if the blood glucose levels get low?

a)

lots more is produced

b)

nothing - low blood glucose has no effect on insulin levels

c)

less / no insulin is produced

128.
What happens if glucose levels fall?
a)
Insulin levels rise
b)
glucagon levels rise
c)
glucagon levels drop
d)
glycogen levels rise
129.

According to the feedback loop, what does high blood sugar promote?

a)

Insulin Release

b)

Glucagon Release

c)

Insulin Uptake

d)

Glycogen Uptake

130.

What is the difference between what will happen if their is too much Glucose or too little Glucose? SELECT ALL THAT APPLY

a)

With too much Glucose, Insulin is released. With too little Glucose, Glucagon is released.

b)

With too much Glucose, the pancreas produces insulin. With too little Glucose, the pancreas produces glucagon.

c)

With too much Glucose, Glucagon is released. With too little Glucose, Insulin is released.

d)

There is no difference.

131.
Name the levels of organization in the human body in order from smallest to largest:
a)
Tissue, organ, organ system
b)
Organ system, tissue, organs, cells
c)
Cells, tissue, organs, organ system
d)
Cells , organs, tissue, organ system
132.

When your glucose levels are too high, what is the appropriate response?

a)

urinate

b)

release glucagon

c)

eat sugar

d)

release insulin

133.

Which of the following correctly pairs the hormone and the response that it causes

a)

Glucagon - makes body cells take in glucose

b)

Insulin - makes body cells take in glucose

c)

Pancreas - makes liver release stored glucagon

d)

Liver - makes pancreas take in stored insulin

134.

Glucagon causes muscles and the liver to release _____ back into the bloodstream

a)

glucose

b)

glucagon

c)

glycogen

d)

insulin

135.

Which hormone is released when blood sugar gets too low?

a)

glucose

b)

glucagon

c)

glycogen

d)

insulin

136.

Which hormone is released when blood sugar gets too high?

a)

glucose

b)

glucagon

c)

glycogen

d)

insulin

137.

which organ will balance the glucose level in the blood by releasing hormones like insulin or glucagon?

a)

Stomach

b)

Small intensine

c)

large intestine

d)

Pancreas

138.

What is the point of a feedback loop?

a)

To provide the body with more energy

b)

To provide the body with more food

c)

To make sure the conditions in the body are always changing

d)

To make sure the conditions in the body remain stable

139.

What are reflexes?

a)

Actions performed in response to a stimulus with conscious thought

b)

Actions performed in response to a stimulus without conscious thought

c)

Actions performed in response to a stimulus with deliberate actions

d)

Actions performed in response to a stimulus with decision making

140.

How do reflexes help us?

a)

By minimizing potential damage to the body

b)

By involving the brain in the reflex actions

c)

By reducing the chances of being injured or killed

d)

By following a sequence that involves the brain

141.

How are reflexes and the Central Nervous System related?

a)

They are not related

b)

Reflexes are controlled by the Central Nervous System

c)

Reflexes are independent of the Central Nervous System

d)

Reflexes are only related to the brain

142.

What is a reflex arc?

a)

A sequence of actions performed in response to a stimulus

b)

A pathway followed by a reflex action

c)

A type of reflex that involves the brain

d)

A reflex that occurs in the spinal cord

143.

How do reflexes prevent your eyes from being damaged?

a)

By involving the brain in the reflex actions

b)

By triggering muscles to contract and move away from the danger

c)

By following a sequence that involves the conscious part of the brain

d)

By sending information to the brain for processing

144.

What is the purpose of reflex actions?

a)

To involve the brain in the response to a stimulus

b)

To perform deliberate actions in response to a stimulus

c)

To automatically and quickly respond to stimuli without conscious thought

d)

To follow a sequence that involves the conscious part of the brain

145.

During a soccer game, Anika accidentally kicks the ball towards Noah's face. What is the advantage of Noah's reflex action to protect his face?

a)

They are faster than deliberate actions

b)

They involve the brain in decision making

c)

They prevent chronic stress or panic attacks

d)

They are necessary for survival

146.

What is the general sequence followed by a reflex action?

a)

Stimulus, Receptor, Effector, Response

b)

Sensory Neuron, Motor Neuron, Interneuron

c)

Spinal cord, Brain, Sensory Neuron, Motor Neuron

d)

Decision Making, Interneuron, Effector, Response

147.

During a game of catch, when does decision making occur in the reflex arc for Liam to catch the ball?

a)

During the sensory neuron stage

b)

During the motor neuron stage

c)

During the interneuron stage

d)

During the brain stage

148.

What is the role of the brain in a reflex arc?

a)

To bypass information and occur mostly in the spinal cord

b)

To receive information and be involved in the reflex

c)

To prevent injury and minimize potential damage to the body

d)

To trigger muscles to contract and move away from the danger

149.

What type of neuron is A?

a)

Sensory

b)

Inter

c)

Motor

150.

What type of neuron is C?

a)

Sensory

b)

Inter

c)

Motor

151.

Name an effector in this diagram.

a)

A

b)

B

c)

D

d)

E

e)

F

152.

Select two examples of effectors.

a)

Neuron

b)

Gland

c)

Muscle

d)

Receptor

153.

Which statement best describes a reflex?

a)

Slow response that you have to think about

b)

Rapid response to protect body from harm

154.
Salivary glands are an example of ...
a)
A receptor
b)
A relay
c)
A detector
d)
An effector
155.
What is the neuron found only in the spinal cord?
a)
Relay
b)
Sensory
c)
Motor
d)
Reflex
156.
What makes up the CNS
a)
brain and spinal cord
b)
brain and neurons
c)
brain
d)
spine and neurons
157.

_____ neurons carry messages away from the central nervous system and out to muscles or glands. The RED neuron in diagram.

a)

sensory

b)

motor

c)

inter

d)

central

158.

Which type of neuron causes a muscle to contract in a reflex arc?

a)

Motor Neuron

b)

Sensory Neuron

c)

Interneuron

d)

Effector

159.

Where would the nerve impulse start in this reflex arc?

a)

A

b)

C

c)

D

d)

E

160.

What type of neuron is A?

a)

Sensory

b)

Inter

c)

Motor

161.

Which is the correct order of neurons in a reflex arc?

a)

Sensory neuron, motor neuron, relay neuron

b)

Relay neuron, sensory neuron, motor neuron

c)

Sensory neuron, relay neuron, motor neuron

162.

What is the final component of a reflex arc?

a)

Effector

b)

Receptor

c)

Afferent Pathway

163.

Which number represents the stimulus?

a)

1

b)

2

c)

3

d)

4

164.

Which number represents the effector?

a)

4

b)

5

c)

6

d)

7

165.

Which number represents the sensory neuron?

a)

3

b)

4

c)

5

d)

7

166.

Which numbers represents the neurons in a reflex arc?

a)

3

b)

4

c)

5

d)

7

167.

In a reflex arc, the sensory neuron leads to the ___________ and the motor neuron leads to the __________

a)

Spinal cord, CNS

b)

CNS, muscle

c)

Spinal cord, muscle

d)

Muscle, CNS

168.

Reflex actions are important because

a)

They provide a quick, involuntary response

b)

They prevent injury

c)

They are essential to the survival of organisms

d)

All of the above

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