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Muscle Physiology

Total questions: 41

Worksheet time: 24mins

Name
Class
Date
1.

Which thin filament protein bind to Ca during muscle contraction?

a)

Actin

b)

Myosin

c)

Troponin

d)

Tropomyosin

2.

Click all that apply. Which of these make up a motor unit?

a)

Motor neuron

b)

Motor fiber

c)

Muscle

d)

Nerve

3.

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

a)

T Tubule

b)

Sarcolemma

c)

Sarcoplasm

d)

Nucleus

4.

What is the contractile unit of the muscle?

a)

Z disk

b)

Sarcomere

c)

Muscle fiber

d)

Muscle cell

5.

What protein makes up the thick filaments?

a)

Troponin

b)

Tropomyosin

c)

Myosin

d)

Actin

6.

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

a)

T tubule

b)

Sarcolemma

c)

Nucleus

d)

Sarcoplasmic reticulum

7.

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

a)

Sarcoplasm

b)

Sacolemma

c)

Neuromuscular junction

d)

Axon terminal

8.

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

a)

Acetylcholine

b)

Acetone

c)

ATP

d)

Calcium

9.

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

10.

Myofibrils are composed primarily of

a)

actin and myosin

b)

ATP and ADP

c)

Troponin

d)

Tropomyosin

11.

Which of the following muscle types are voluntary?

a)

Skeletal

b)

Cardiac

c)

Smooth muscle

12.

Which cell organelle provides energy for muscle contraction?

a)

lysosome

b)

nucleus

c)

endoplasmic reticulum

d)

mitochondria

13.

During a muscle contraction, cross-bridges from between what two structures?

a)

Actin and myosin fibers

b)

neuron and muscle

c)

mitochondria and actin

14.

Vesicles in the motor neuron store what substance?

a)

cholinsterase

b)

acetylcholine

c)

calcium

d)

curare

15.

Muscle fatigue is likely due to the build up of

a)

acetylcholine

b)

cholinsterase

c)

lactic acid

d)

glucose

16.

The smallest unit of contraction is the

a)

Myosin

b)

Sarcomere

c)

Myofibril

d)

Fascicle

17.

Which type of muscle tissue is involuntary?

a)

Skeletal muscle

b)

Cardiac muscle

c)

Smooth muscle

18.

What is the energy source that is used for all contractions?

a)

Glucose

b)

Creatine

c)

ATP

d)

Oxygen

19.

The protein that covers the binding site on actin when a muscle is relaxed is called

a)

Troponin

b)

Myosin

c)

Tropomyosin

d)

Myofibril

20.

This structure stores calcium in the muscle cell

a)

Sarcolemma

b)

Sarcoplasmic reticulum

c)

Sarcomere

21.

This is a picture of

a)

Tropomyosin

b)

Actin

c)

Myosin

d)

The thin filament

22.
Once calcium is released, it will
a)
attaches to myosin head
b)
attaches to receptors 
c)
attaches to tropomyosin
d)
attaches to troponin
23.
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
24.
Which one of the following is a key characteristic of Fast Twitch B muscle fibers? 
a)
They are Red in color, meaning they contain a lot of mitochondria
b)
They contract rapidly with great force but fatigue fast (as they use creatine phosphate pathway)
c)
They are recruited for long duration activities
d)
They contain high numbers of Mitochondria
25.
Which one of the following is a key characteristic of slow twitch muscle fibers? 
a)
They contain large amounts of Mitochondria
b)
They are fast to fatigue
c)
They are recruited last
d)
They contain low numbers of Mitochondria
26.
What two chemicals are necessary for muscle contraction to occur?
a)
Niacin and Potassium
b)
Calcium and ATP
c)
Sodium and Potassium
d)
Ach and Potassium
27.
The muscle that contracts during movement is called the
a)
agonist
b)
antagonist
c)
synergist
28.

What would be the correct order of the steps?


  1. Action potential travels down T-tubules.
  2. Nerve impulse reaches the muscle.
  3. Calcium binds to troponin.
  4. Tropomyosin moves.
a)

1, 2, 3, 4

b)

4, 3, 2, 1

c)

3, 4, 1, 2

d)

2, 1, 3, 4

29.

Scientific name for muscle fiber bundle.

a)

Epimysium

b)

Fascicle

c)

Myofibril

d)

Myofilament

30.

Tough connective tissue sheath that surrounds the entire muscle.

a)

Endomysium

b)

Epimysium

c)

Fascicle

d)

Perimysium

31.

Connective tissue sheath that surrounds muscle fibers.

a)

Endomysium

b)

Epimysium

c)

Fascicle

d)

Perimysium

32.

Long organelles in the myofibrils.

a)

Fascicle

b)

Myofilaments

c)

Sarcomere

d)

Sarcolemma

33.

Disappears when the muscle is contracted.

a)

I band

b)

A band

c)

H-zone

d)

M-line

34.

Which label is the sarcolemma?

a)

A

b)

B

c)

C

d)

D

35.

Which label is the muscle fiber?

a)

A

b)

B

c)

C

d)

D

36.

Which label indicates the sarcomere?

a)

H

b)

I

c)

J

d)

K

37.

Which label indicates the H-zone?

a)

J

b)

K

c)

L

d)

M

38.

Which label indicates the I band?

a)

H

b)

I

c)

J

d)

K

39.

Which label indicates the A band?

a)

J

b)

K

c)

L

d)

M

40.

Is the muscle shown contracted or relaxed?

a)

Contracted

b)

Relaxed

41.

Is the muscle shown contracted or relaxed?

a)

Contracted

b)

Relaxed

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