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2113 - A&P 1 - Chapter 10 - Muscle Physiology

Total questions: 42

Worksheet time: 16mins

Name
Class
Date
1.

Which thin filament protein bind to Ca during muscle contraction?

a)

Actin

b)

Myosin

c)

Troponin

d)

Tropomyosin

2.

What is the name of the plasma membrane surrounding each muscle fiber?

a)

T Tubule

b)

Sarcolemma

c)

Sarcoplasm

d)

Nucleus

3.

What is the contractile unit of the muscle?

a)

Z disk

b)

Sarcomere

c)

Muscle fiber

d)

Muscle cell

4.

What protein makes up the thick filaments?

a)

Troponin

b)

Tropomyosin

c)

Myosin

d)

Actin

5.

What part of the muscle fiber stores Ca ions and releases them when stimulated?

a)

T tubule

b)

Sarcolemma

c)

Nucleus

d)

Sarcoplasmic reticulum

6.

What is the name of the location where the neuron and muscle fiber meet?

a)

Sarcoplasm

b)

Sacolemma

c)

Neuromuscular junction

d)

Axon terminal

7.

What is the name of the neurotransmitter that is released from the neuron to the sarcolemma?

a)

Acetylcholine

b)

Acetone

c)

ATP

d)

Calcium

8.

Which of these occurs first during a muscle contraction?

a)

The nerve signal reaches the neuromuscular junction

b)

Ach is released and opens Na ion channels

c)

The sarcomere shortens

d)

The myosin binds to the actin

9.

Which of these occurs last during a muscle contraction?

a)

The nerve signal reaches the neuromuscular junction

b)

Ach is released and opens Na ion channels

c)

The sarcomere shortens

d)

The myosin binds to the actin

10.

Myofibrils are composed primarily of

a)

actin and myosin

b)

ATP and ADP

c)

Troponin

d)

Tropomyosin

11.

Neurotransmitters are stored in vesicles within

a)

motor units

b)

motor neuron endings

c)

myofibrils

d)

motor end plates

12.

The enzyme cholinesterase causes acetylcholine to

a)

be secreted from the motor end plate.

b)

form cross bridges.

c)

bind to actin.

d)

decompose.

13.

Which cell organelle provides energy for muscle contraction?

a)

lysosome

b)

nucleus

c)

endoplasmic reticulum

d)

mitochondria

14.

A person who has a disease that inhibits the production of cholinesterase would have what kind of symptoms?

a)

prolonged muscle contraction

b)

flacid muscles

c)

inability to speak

d)

paralyzed

15.
Which of the following best describes actin filaments?
a)
A thin filament made of two intertwining strands whose subunits bind together like beads on a string
b)
A thick filament that looks like two golf clubs twisted together
c)
A small, globular regulatory protein that holds another protein in place
d)
A long, ropelike regulatory protein that spirals around another protein, covering its active sites
16.
This is a band of connective tissue that surrounds whole muscles.
a)
ligament
b)
endomysium
c)
epimysium
d)
perimysium
17.

The structure labeled "G" is the ....

a)

A band

b)

I band

c)

Myosin

d)

H zone

18.

The structure labeled "B" is covered in ....

a)

endomysium

b)

sarcolemma

c)

perimysium

d)

epimysium

19.

The substance labeled "C" is stored inside of which structure?

a)

synaptic cleft

b)

synaptic vesicle

c)

motor end plate

d)

sarcoplasmic reticulum

20.

This structure is made of overlapping ACTIN and MYOSIN to produce a dark band.

a)

Structure A

b)

Structure D

c)

Structure G

d)

Structure F

21.

What is the cell membrane of structure C called?

a)

Epimysium

b)

Endomysium

c)

Sarcolemma

d)

Both Endomysium AND Sarcolemma

22.

Structure B is correctly identified as the ...

a)

A band

b)

I band

c)

actin protein

d)

myosin protein

23.

The structure labeled "F" is most likely ...

a)

The axon of a MOTOR neuron

b)

The axon of a SENSORY neuron

c)

The motor end plate

d)

The neuromuscular junction

24.

Identify structure "A"

a)

muscle fiber

b)

myofibril

c)

nucleus

d)

sarcolemma

25.

Which structure in the figure is responsible for releasing Calcium ions to facilitate actin / myosin binding?

a)

Structure H, Sarcoplasmic reticulum

b)

Structure E, Synaptic cleft

c)

Structure C, Synaptic vesicles

d)

Structure F, Motor end plate

26.

The protein MYOSIN is indicated by which letter?

a)

structure A

b)

structure B

c)

Structure C

d)

Structure D

27.
Once calcium is released, it will
a)
attaches to myosin head
b)
attaches to receptors 
c)
attaches to tropomyosin
d)
attaches to troponin
28.
Number 3 represents which of the following events
a)
action potential reaches the axon terminal
b)
sodium rushes into the muscle fiber
c)
potassium leaving the muscle fiber
d)
ACh crossing the synaptic cleft
29.
Which of the following is the name given to the connective tissue that covers of a muscle fascicle or bundle of muscle?
a)
Endomysium
b)
Perimysium
c)
Epimysium
d)
Myofilament
30.

The contraction and then relaxation of a muscle in response to a stimulus that causes an action potential in one or more muscle fibers.

a)

Muscle Contraction

b)

Muscle Twitch

c)

Muscle Stitch

d)

Muscle Fatigue

31.

What is the energy source of "Aerobic Glycolysis"?

a)

Creatine Phosphate

b)

Lactic Acid

c)

Amino Acids

d)

Glucose

32.

________ Muscle Contractions- when tension remains the same, muscles shorten, used in movement.

a)

Isometric

b)

Isotonic

c)

Oblique

33.

The structure between the muscle and bone is called a(n):

a)

Tendon

b)

Muscle

c)

Ligament

d)

Sprain

34.

The area between the neuron and muscle is the:

a)

T-tubules

b)

Synaptic Cleft

c)

Terminal cisternea

d)

Sarcoplasmic reticulum

35.

Isometric contractions examples are EXCEPT:

a)

Sit-ups

b)

Arm hangs

c)

Planks

d)

Wall sits

36.

Flat tendon

a)

Blood Vessel

b)

Muscle Fiber

c)

Fascia

d)

Aponeurosis

37.

T/F: Cross bridge cycle is a series of events during which actin heads pull thin filaments toward the center of the sarcomere.

a)

TRUE

b)

FALSE

38.

What happens in the neuromuscular junction? Put in order


1. Acetylcholinesterase degrades Ach

2. ACh diffuses across to ACh receptors (Na+ chemical gates) on the sarcolemma

  1. 3. Electrical impusle arrives at the axon terminal

4. Calcium entry causes the release of ACh neurotransmitter into the synaptic cleft

5. ACh binding to receptors, opens gates, allowing Na+ to enter resulting in motor end-plate potential

6. Voltage-gated calcium channels open, calcium enters the motor neuron

(a)  

39.

During Power Stroke ( myosin is attached to actin), how is the ATP molecule?

a)

There is no energy molecule at this moment. The energy was already released to allow the binding.

b)

ATP is intact and completely attached to the myosin head

c)

ATP was previously hydrolyzed in ADP + Pi, and the energy released from this reaction promotes the Power Stroke

40.

Do the lengths of the thick and thin filaments change during contraction?

a)

Yes

b)

No

41.

What is happens to the A band during contraction?

a)

It grows in size

b)

It stays the same

c)

It shrinks in size

42.

What happens to the H zone and I Band during contraction?

a)

They grow in size

b)

They stay the same

c)

They shrink in size

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