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Worksheets

Exploring the Skeletal and Muscular Systems

Total questions: 173

Worksheet time: 3hrs 42mins

Name
Class
Date
1.

Which bone is commonly known as the collarbone? (Refer to the diagram provided by your teacher)

a)

Femur

b)

Clavicle

c)

Tibia

d)

Scapula

2.

What is the largest bone in the human body? (Refer to the diagram provided by your teacher)

a)

Humerus

b)

Femur

c)

Radius

d)

Ulna

3.

Which muscle is primarily responsible for flexing the forearm? (Refer to the diagram provided by your teacher)

a)

Biceps brachii

b)

Triceps brachii

c)

Deltoid

d)

Pectoralis major

4.

What type of joint is found in the shoulder?

a)

Hinge joint

b)

Ball-and-socket joint

c)

Pivot joint

d)

Saddle joint

5.

Which of the following is NOT a function of the skeletal system?

a)

Producing blood cells

b)

Storing minerals

c)

Pumping blood

d)

Providing structure

6.

What is the main function of tendons?

a)

Connect bone to bone

b)

Connect muscle to bone

c)

Protect internal organs

d)

Store fat

7.

Which protein is directly involved in muscle contraction?

a)

Myosin

b)

Collagen

c)

Elastin

d)

Keratin

8.

Where is red blood cell production primarily located?

a)

Muscle tissue

b)

Bone marrow

c)

Cartilage

d)

Tendons

9.

Which bone protects the brain? (Refer to the diagram provided by your teacher)

a)

Sternum

b)

Cranium

c)

Pelvis

d)

Patella

10.

Which muscle is found in the front of the thigh? (Refer to the diagram provided by your teacher)

a)

Gastrocnemius

b)

Quadriceps

c)

Hamstring

d)

Gluteus maximus

11.

What type of joint is found in the knee?

a)

Ball-and-socket joint

b)

Hinge joint

c)

Pivot joint

d)

Gliding joint

12.

Which of the following is a function of the muscular system?

a)

Producing hormones

b)

Movement of the body

c)

Filtering blood

d)

Digesting food

13.

Which bone forms the lower jaw? (Refer to the diagram provided by your teacher)

a)

Maxilla

b)

Mandible

c)

Zygomatic

d)

Temporal

14.

Which muscle is responsible for extending the forearm? (Refer to the diagram provided by your teacher)

a)

Biceps brachii

b)

Triceps brachii

c)

Deltoid

d)

Latissimus dorsi

15.

What is the function of ligaments?

a)

Connect muscle to bone

b)

Connect bone to bone

c)

Produce blood cells

d)

Store calcium

16.

Which type of joint allows rotation around a single axis?

a)

Hinge joint

b)

Pivot joint

c)

Ball-and-socket joint

d)

Saddle joint

17.

Which bone is located in the upper arm? (Refer to the diagram provided by your teacher)

a)

Radius

b)

Ulna

c)

Humerus

d)

Fibula

18.

Which muscle is found in the calf? (Refer to the diagram provided by your teacher)

a)

Quadriceps

b)

Gastrocnemius

c)

Biceps femoris

d)

Sartorius

19.

What is the main function of the rib cage? (Refer to the diagram provided by your teacher)

a)

Support movement

b)

Protect the heart and lungs

c)

Store fat

d)

Produce hormones

20.

Which protein works with myosin during muscle contraction?

a)

Actin

b)

Collagen

c)

Elastin

d)

Keratin

21.

Which bone is commonly called the kneecap? (Refer to the diagram provided by your teacher)

a)

Patella

b)

Tibia

c)

Fibula

d)

Femur

22.

Which muscle is located in the chest? (Refer to the diagram provided by your teacher)

a)

Deltoid

b)

Pectoralis major

c)

Trapezius

d)

Latissimus dorsi

23.

Which type of joint is found in the thumb?

a)

Ball-and-socket joint

b)

Saddle joint

c)

Hinge joint

d)

Pivot joint

24.

What is the function of the vertebral column? (Refer to the diagram provided by your teacher)

a)

Protect the brain

b)

Support the body and protect the spinal cord

c)

Store minerals

d)

Produce hormones

25.

Which muscle is responsible for smiling? (Refer to the diagram provided by your teacher)

a)

Masseter

b)

Zygomaticus

c)

Temporalis

d)

Sternocleidomastoid

26.

Which bone is part of the pelvis? (Refer to the diagram provided by your teacher)

a)

Scapula

b)

Ilium

c)

Clavicle

d)

Sternum

27.

What is the role of tendons in movement?

a)

They contract to move bones

b)

They transmit force from muscle to bone

c)

They cushion joints

d)

They produce blood cells

28.

Which muscle is located at the back of the upper arm? (Refer to the diagram provided by your teacher)

a)

Biceps brachii

b)

Triceps brachii

c)

Deltoid

d)

Flexor carpi

29.

Which type of joint allows the greatest range of motion?

a)

Hinge joint

b)

Ball-and-socket joint

c)

Pivot joint

d)

Gliding joint

30.

Which process describes how muscles do work?

a)

Muscles push bones

b)

Muscles contract and pull on bones

c)

Muscles expand and push bones

d)

Muscles produce hormones

31.

The smallest unit of all organisms are _____.

a)

cells

b)

tissues

c)

organs

32.

Groups of tissues form ______________.

a)

cells

b)

tissues

c)

organs

33.

All systems working together make an _____________.

a)

organ

b)

organism

c)

system

34.

Which system's primary function is movement and flexibility?

a)

muscular

b)

skeletal

35.

Which system's primary function is to protect and support the body?

a)

muscular

b)

skeletal

36.

Voluntary muscles are muscles we can control.

a)

True

b)

False

37.

Which type of muscle is not striped and is found in the walls of the digestive track?

a)

cardiac

b)

skeletal

c)

smooth

38.

Involuntary muscles cannot be controlled.

a)

True

b)

False

39.

What is a joint?

a)

Another word for bone

b)

A place where two bones meet.

c)

Huh?

40.

Which type of muscle is striped and attached to bones?

a)

cardiac

b)

smooth

c)

skeletal

41.

Which type of muscle is striped and is found in the heart?

a)

cardiac

b)

smooth

c)

skeletal

42.

Which is the process where the body works to keep its internal environment constant (balanced)?

a)

cell

b)

tissue

c)

homeostasis

d)

muscular

43.

Which shows the correct levels of organization?

a)

organ, tissue, cell

b)

cell, tissue, organ, system

c)

cell, cell, all the cells

d)

tissue, organ, cell

44.

Which of the following is NOT a function of the skeletal system?

a)

movement

b)

shape

c)

blood cell formation

d)

digestion

45.
The skeletal system does all of the following EXCEPT
a)
produces red blood cells
b)
stores calcium and minerals
c)
protects organs
d)
excretes waste
46.
attaches muscle to bone 
a)
tendon
b)
ligament 
47.
How many bones are in the adult human body?
a)
200
b)
206
c)
205
d)
204
48.
What are the main functions of the skeleton?
a)
A) protection
b)
b) Body shape 
c)
C) movement
d)
D) A,b and c
49.
The bone marrow makes
_______________________ cells.
a)
blood
b)
cancer
c)
large
d)
normal
50.
What are the 3 types of muscle tissue?
a)
Thigh, Calf, & Shoulder
b)
Traps, Forearm, & Abs
c)
Hamstring, Biceps, & Triceps
d)
Smooth Muscle, Cardiac Muscle, & Skeletal Muscle
51.
Which muscles are involuntary?
a)
skeletal
b)
cardiac
c)
smooth
d)
smooth and cardiac
52.
Which types of muscle tissue are voluntary?
a)
Cardiac
b)
Skeletal
c)
Smooth
d)
Cardiac and Smooth
53.
Cardiac muscles are ONLY located in the heart
a)
TRUE
b)
FALSE
54.
Voluntary muscle is
a)
muscle that has to be told when to move
b)
muscle that moves automatically
c)
muscle that needs to be stretched regularly
d)
muscle that makes up the heart and stomach
55.
Involuntary muscle is 
a)
muscle found in the heart
b)
muscle found in the organs
c)
muscle that works automatically
d)
all of these are true
56.

Which is an example of a function the muscular system performs?

a)

Voluntary muscles pump blood through the body.

b)

Skeletal muscles keep a joint's working properly.

c)

Cardiac muscles move bones and hold a body's skeleton in place.

d)

Smooth muscle help move food through the organs they surround.

57.

Which best describes the purpose of the muscular system?

a)

The muscular system carries messages from the brain to the bones to move the body.

b)

The muscular system keeps the bones strong and protects them from being broken.

c)

The muscular system produces energy the body needs to be able to move.

d)

The muscular system allows movement of bones and helps maintain posture.

58.

Which body systems work together to allow the body to move?

a)

nervous and skeletal

b)

muscular and skeletal

c)

nervous and circulatory

d)

muscular and circulatory

59.

How does the skeletal system benefit the nervous system?

a)

It protects the lungs.

b)

It protects the heart.

c)

It protects the brain and spinal cord.

d)

It protects the esophagus and stomach.

60.

Where are the red blood cells made in the body?

a)

muscle fibers

b)

bone marrow

c)

circulatory system

d)

blood

61.

What attaches muscle to bone?

a)

ligament

b)

tendon

c)

muscle

d)

femur

62.
The knee and elbow are known as what kind of joints?
a)
fixed
fixed
b)
ball and socket
c)
hinge
d)
pivot
63.
The digestive system uses these types of muscles to aid in digestion?
a)
smooth
b)
cardiac
c)
skeletal
64.
The heart is made up of what type of muscle?
a)
smooth 
b)
cardiac
c)
skeletal
65.
The muscles that help with movement are known as ________ muscles. 
a)
smooth
b)
cardiac
c)
skeletal
66.
Which body system provides support, protection, and movement for the body?
a)
digestive
b)
skeletal
c)
circulatory
d)
respiratory
67.
What attaches bone to bone?
a)
tendon
b)
ligament
c)
muscle
d)
skull
68.
What are joints?
a)
A place where one bone meets 
b)
A place where two bones meet 
c)
Bones don't meet 
d)
They connect bone to muscle
69.
Movements that you cannot control are called ___________. 
a)
Strain
b)
Sprain
c)
Voluntary
d)
Involuntary
70.
Movements that you choose to control are called?
a)
Cramp
b)
Voluntary
c)
Strain
d)
Involuntary
71.
The cardiac muscle in the body is the:
a)
Bicep
b)
Heart
c)
Tricep
d)
Hamstring
72.
Your skeleton is there for support, protection, and movement. But you could not move your bones without the help of your ______________ system.
a)
digestive
b)
muscular
c)
respiratory
d)
circulatory
73.
What is the main  function of the muscular system?
a)
 It carries messages from the brain to the bones to move the body.
b)
It allows movement of bones and helps maintain posture.
c)
It cleans the blood and removes waste. 
74.
Which is NOT a function of the skeletal system?
a)
producing blood cells
b)
protecting internal organs
c)
providing shape and support
d)
getting oxygen into your body
75.
The Skeletal System does what?
a)
Support your body
b)
Help your body move with muscles
c)
all of the above
d)
protect your organs
76.
What are the 3 types of muscles?
a)
Cardiac, smooth and skeletal
b)
Cardiac, skeletal, prime
c)
Flexion, extension, smooth
d)
Skeletal, smooth, stringy
77.
What are the two movements of muscles?
a)
Up and down
b)
Lengthening and shortening
c)
Left and right
d)
Big and small
78.
Make sure you get enough _______, __________ and ________ in order to keep your skeletal and muscular system healthy.
a)
sleep, gluteus maximus, nutrition
b)
sleep, exercise, sugar
c)
sleep, exercise, good nutrition
d)
exercise, exercise, exercise! 
79.
Which system of the human body provides protection to most of the major organs?
a)
skeletal system
b)
circulatory system
c)
muscular system
d)
digestive system
80.
Which best explains how a single-celled organism can survive without other cells? 
a)
They do not need any substance from outside of the cell.
b)
They are able to perform all necessary functions within one cell.
c)
They do not need to perform more than one function to survive
81.
What are bones used for?
a)
support, protection, digestion, shape
b)
support, movement, protection, shape, make calcium 
c)
support, protection, sanitation, shape
d)
make blood, shape, protection, structure
82.
The skeletal system does all of the following EXCEPT
a)
produces red blood cells
b)
stores calcium and minerals
c)
protects organs
d)
excretes waste
83.
Muscle always work ___________
a)
in pairs.
b)
alone.
c)
in groups of three.
84.
attaches bone to bone
a)
tendon
b)
ligament 
85.
The skeletal system does all of the following EXCEPT
a)
produces red blood cells
b)
stores calcium and minerals
c)
protects organs
d)
excretes waste
86.
attaches muscle to bone 
a)
tendon
b)
ligament 
87.
How many bones are in the adult human body?
a)
200
b)
206
c)
205
d)
204
88.
What are the main functions of the skeleton?
a)
A) protection
b)
b) Body shape 
c)
C) movement
d)
D) A,b and c
89.
One of the main jobs of cartilage is to
a)
make blood
b)
make marrow
c)
cushion bones
d)
hold fingers together
90.
The only bone in the human body that can not heal itself?
a)
Clavicle
b)
Sternum
c)
Teeth
d)
Knee Cap
91.
The bone marrow makes
_______________________ cells.
a)
blood
b)
cancer
c)
large
d)
normal
92.
No movement would occur without the skeletal system.
a)
True
b)
False
c)
Huh?
93.
What are the 3 types of muscle tissue?
a)
Thigh, Calf, & Shoulder
b)
Traps, Forearm, & Abs
c)
Hamstring, Biceps, & Triceps
d)
Smooth Muscle, Cardiac Muscle, & Skeletal Muscle
94.
Which muscles are involuntary?
a)
skeletal
b)
cardiac
c)
smooth
d)
smooth and cardiac
95.
When a muscle contracts, it _______
a)
gets longer
b)
gets shorter
c)
gets thinner
d)
grows hair
96.
Which types of muscle tissue are voluntary?
a)
Cardiac
b)
Skeletal
c)
Smooth
d)
Cardiac and Smooth
97.
Skeletal muscles are attached to the _________.
a)
Stomach
b)
Lungs
c)
Bones
d)
Involuntary Muscles
98.
Cardiac muscles are ONLY located in the heart
a)
TRUE
b)
FALSE
99.
Muscles always work in _____
a)
pairs
b)
groups of 3
c)
bones
d)
joints
100.
Voluntary muscle is
a)
muscle that has to be told when to move
b)
muscle that moves automatically
c)
muscle that needs to be stretched regularly
d)
muscle that makes up the heart and stomach
101.
Involuntary muscle is 
a)
muscle found in the heart
b)
muscle found in the organs
c)
muscle that works automatically
d)
all of these are true
102.

Which best describes the function of the skeletal system?

a)

It transports oxygen to cells and tissues

b)

It gives shape and support to the human body.

c)

It takes in and breaks down all necessary nutrients for the body.

103.

Which body system's main purpose is to help the body move?

a)

digestive system

b)

muscular system

c)

respiratory system

104.

Which is an example of a function the muscular system performs?

a)

Voluntary muscles pump blood through the body.

b)

Skeletal muscles keep a joint's working properly.

c)

Cardiac muscles move bones and hold a body's skeleton in place.

d)

Smooth muscle help move food through the organs they surround.

105.

Which two systems work together to help a person stand up straight?

a)

skeletal and muscular

b)

skeletal and digestive

c)

skeletal and respiratory

d)

skeletal and cardiovascular

106.

Which best describes how the muscular system impacts movement of the human body?

a)

When a muscle expands, it pulls on the bone it is connected to and the bone moves.

b)

When a muscle contracts, it pulls on the bone it is connected to and the bone moves.

c)

When a muscle contracts, it pushes on the bone it is connected to and the bone moves.

d)

When a muscle expands, it pushes on the bone jit is connected to and the bone moves.

107.

Which body systems work together to allow the body to move?

a)

nervous and skeletal

b)

muscular and skeletal

c)

nervous and circulatory

d)

muscular and circulatory

108.

How does the skeletal system benefit the nervous system?

a)

It protects the lungs.

b)

It protects the heart.

c)

It protects the brain and spinal cord.

d)

It protects the esophagus and stomach.

109.

How does the skeletal system benefit the digestive system?

a)

It protects organs within the system.

b)

It supplies blood to organs within the system.

c)

It provides oxygen to organs within the system.

d)

It provides nutrients to organs within the system.

110.

Which system produces red blood cells?

a)

skeletal

b)

nervous

c)

digestive

d)

circulatory

111.

What joint has a ball end of one bone fitting into a cuplike cavity on another bone?

a)

ball-and-socket

b)

hinge

c)

sliding

d)

fixed

112.

What type of muscle is only found in your heart?

a)

cardiac

b)

smooth

c)

skeletal

113.

What type of muscle makes you walk?

a)

skeletal

b)

smooth

c)

cardiac

114.

This is a type of muscle I can move.

a)

voluntary

b)

involuntary

115.

A tendon is:

a)

cordlike tissue and connects muscles to bones

b)

A broad sheet of dense connective tissue that connects muscles to muscles

c)

cordlike tissue and connects bones to bones

d)

A broad sheet of dense connective tissue that connects bones to bones

116.

Which of the following is NOT a function of the muscular system?

a)

Promotes growth

b)

Movement

c)

Maintains posture

d)

Generates heat

117.

Tendons connect __________ to _________ whereas ligaments connect ___________ to ____________.

a)

Bone to bone; muscle to bone

b)

Muscle to bone; bone to bone

c)

Bone to bone; Muscle to muscle

d)

Muscle to muscle; bone to muscle

118.
The adult skeletal system is composed of how many bones?
a)
216
b)
371
c)
206
d)
199
119.

The skeletal and muscular systems work together to allow the body to move.

a)

True

b)

False

120.

Besides providing support, protection, and allowing movement, the skeletal system...

a)

helps to digest food.

b)

absorbs water into the blood stream.

c)

makes blood cells.

d)

produces the majority of body heat.

121.

What is the cushion between bones?

a)

cartilage

b)

calcium

c)

ligament

d)

marrow

122.

There are four types of joints that we talked about in class. They are pivot, gliding...

a)

scrubbing, and spinning.

b)

connective, and cartilage.

c)

compact, and spongy.

d)

hinge, and ball-and-socket.

123.

What type of muscle lines the digestive system and blood vessels?

a)

smooth

b)

cardiac

c)

skeletal

124.

The skeletal muscles work in pairs (i.e. when one tightens, the other relaxes).

a)

true

b)

false

125.

How many muscles in the human body?

a)

206

b)

260

c)

300

d)

640

126.

Which of the following is one of the functions of the human skeleton?

a)

produce hormones

b)

bringing gases into the body

c)

removing waste from the body

d)

providing a site for blood cell formation

127.
Involuntary muscle is 
a)
muscle found in the heart
b)
muscle found in the organs
c)
muscle that works automatically
d)
all of these are true
128.
Voluntary muscle is
a)
muscle that has to be told when to move
b)
muscle that moves automatically
c)
muscle that needs to be stretched regularly
d)
muscle that makes up the heart and stomach
129.
Which types of muscle tissue are voluntary?
a)
Cardiac
b)
Skeletal
c)
Smooth
d)
Cardiac and Smooth
130.
Which muscles are involuntary?
a)
skeletal
b)
cardiac
c)
smooth
d)
smooth and cardiac
131.
What are the 3 types of muscle tissue?
a)
Thigh, Calf, & Shoulder
b)
Traps, Forearm, & Abs
c)
Hamstring, Biceps, & Triceps
d)
Smooth Muscle, Cardiac Muscle, & Skeletal Muscle
132.
What are the main functions of the skeleton?
a)
A) protection
b)
b) Body shape 
c)
C) movement
d)
D) A,b and c
133.

Which of the following is a joint that allows extension and flexing, like the knee?

a)

Hinge Joint

b)

Ball-and-Socket Joint

c)

Plane Joint

d)

Pivot Joint

134.

Which of the following is a muscle with movement that is not under the person's control?

a)

Cartilage

b)

Skeletal Muscle

c)

Voluntary Muscle

d)

Involuntary Muscle

135.

Which of the following is a joint that moves freely in all directions?

a)

Hinge Joint

b)

Ball-and-Socket Joint

c)

Plane Joint

d)

Pivot Joint

136.

Which system of the human body provides protection to most of the major organs?

a)

Skeletal System

b)

Circulatory System

c)

Respiratory System

d)

Muscular System

137.

What is the main function of the skeletal system?

a)

clean the body

b)

support the body

c)

deliver nutrients to the body

138.

A group of organs that work together to perform a similar function.

a)

Tissue

b)

Organ

c)

Organ System

d)

Tendon

139.

A group of tissues that work together to perform this same function.

a)

Tissue

b)

Organ

c)

Organ Systems

d)

Tendon

140.

A group of cells that work together to perform the same functions.

a)

Tissue

b)

Organs

c)

Organ Systems

d)

Tendons

141.

Muscle tissues are made of ____.

a)

Organs

b)

Muscles

c)

Cells

d)

Tissues

142.

Skeletal muscles ____ on bones causing them to move.

a)

pull

b)

push

c)

slide

d)

shift

143.

When you eat food what type of muscles move the food through your digestive system?

a)

cardiac

b)

skeletal

c)

smooth

144.

Which system of the human body provides protection to most of the major organs?

a)

Skeletal System

b)

Circulatory System

c)

Respiratory System

d)

Muscular System

145.

What is the main function of the skeletal system?

a)

clean the body

b)

support the body

c)

deliver nutrients to the body

146.

Which best describes the function of the skeletal system?

a)

It transports oxygen to cells and tissues

b)

It gives shape and support to the human body.

c)

It takes in and breaks down all necessary nutrients for the body.

147.

Which skeleton makes up the appendages?

a)

Appealicular

b)

Appendicular

c)

Axial

d)

Midicular

148.

Which of the following are bone cells? Select all that apply.

a)

osteoblasts

b)

osteoclasts

c)

osteocytes

d)

Osteobytes

149.

What type of bones are the bones of the limbs?

a)

long bones

b)

short bones

c)

sesamoid bones

d)

flat bones

e)

irregular bones

150.

What type of bones are carpals and tarsals?

a)

long bones

b)

short bones

c)

sesamoid bones

d)

flat bones

e)

irregular bones

151.

What type of bones are found where tendons pass over joints?

a)

long bones

b)

short bones

c)

sesamoid bones

d)

flat bones

e)

irregular bones

152.

What type of bones protect most organs?

a)

long bones

b)

short bones

c)

sesamoid bones

d)

flat bones

e)

irregular bones

153.

What type of bones are found in the vertebral column?

a)

long bones

b)

short bones

c)

sesamoid bones

d)

flat bones

e)

irregular bones

154.

Which type of bone is dense and creates much of the structure of the skeleton?

a)

Compact bone

b)

Spongy bone

c)

Periosteum

d)

Bone marrow

155.

Which type of bone is porous and less dense?

a)

Compact bone

b)

Spongy bone

c)

Periosteum

d)

Bone marrow

156.

Which type of bone fills the cavities of spongy bone and creates blood cells?

a)

Compact bone

b)

Spongy bone

c)

Periosteum

d)

Bone marrow

157.

Which type of bone tissue is a hard outer covering of most bones?

a)

Compact bone

b)

Spongy bone

c)

Periosteum

d)

Bone marrow

158.

What connects bones to other bones?

a)

marrow

b)

skeletal system

c)

cartilage

d)

ligaments

159.

What is a place where to bones meet?

a)

joint

b)

cartilage

c)

marrow

d)

tendon

160.

What connects a muscle to a bone?

a)

joint

b)

cartilage

c)

ligament

d)

tendon

161.

What are the three types of muscles? Select all that apply.

a)

Skeletal

b)

Cardiac

c)

Smooth

d)

Rough

162.

Which type of muscle is striated in appearance and has multiple nuclei?

a)

Skeletal

b)

Cardiac

c)

Smooth

d)

Rough

163.

Which type of muscle is voluntary and is responsible for conscious movement?

a)

Skeletal

b)

Cardiac

c)

Smooth

d)

Rough

164.

Which type of muscle is not striated and is controlled by involuntary movements?

a)

Skeletal

b)

Cardiac

c)

Smooth

d)

Rough

165.

Which type of muscle is found in veins and the digestive tract?

a)

Skeletal

b)

Cardiac

c)

Smooth

d)

Rough

166.

Which is striated but only has one nucleus?

a)

Skeletal

b)

Cardiac

c)

Smooth

d)

Rough

167.

Which type of muscle is found in the heart?

a)

Skeletal

b)

Cardiac

c)

Smooth

d)

Rough

168.

What do we call muscles that can be consciously controlled?

a)

voluntary

b)

involuntary

c)

smooth

d)

cardiac

169.

What do we call muscle you cannot consciously control?

a)

voluntary

b)

involuntary

c)

smooth

d)

cardiac

170.

What enables movement of the body and internal organs?

a)

skeletal system

b)

muscular system

c)

smooth muscle

d)

cardiac muscle

171.
Which muscles are involuntary?
a)
skeletal
b)
cardiac
c)
smooth
d)
smooth and cardiac
172.

Muscles always work in pairs by ________.

a)

moving in any direction on a plane

b)

moving in a circular motion

c)

sitting and standing

d)

contracting and relaxing

173.

When a muscle contracts, it _______.

a)

gets longer

b)

gets shorter

c)

gets thinner

d)

grows hair

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