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Muscle Functions

Total questions: 28

Worksheet time: 13mins

Name
Class
Date
1.

What is the name of the thick myofilaments?

a)

actin

b)

myosin

c)

myoglobin

d)

tropomyosin

2.

What is the name of the thin myofilaments in the muscle cell?

a)

actin

b)

myosin

c)

troponin

d)

collagen

3.
The contractile unit of a muscle is called the __________.
a)
Sarcolemma
b)
Sarcoplasmic reticulum
c)
Sarcoplasm
d)
Sarcomere
4.

Number 3 represents which of the following events

a)

action potential reaches the terminal branches

b)

sodium rushes into the muscle fiber

c)

calcium leaving the sarcoplasmic reticulum

d)

ACh crossing the synapse

5.
Contractions are generated by
a)
shortening of thick filaments
b)
shortening of thin filaments
c)
sliding of thin filaments past thick filaments
d)
"accordian-like" folding of thick and thin filaments
6.

Once calcium is released, it will

a)

attach to the myosin heads

b)

attach to receptors in the T-tubules

c)

attach to actin receptors

d)

attach to the troponin to expose actin receptors

7.

The diagram represents the neuromuscular junctions. Z is pointing to which of the following?

a)

sodium ions used to generate an impulse in the muscle fiber

b)

calcium ions used to trigger muscle contraction

c)

acetylcholine used to stimulate the muscle to contract

d)

potassium ions used to repolarize the neuron

8.

Actin is represented by number...

a)

7

b)

5

c)

4

d)

3

9.

Which structure stores calcium in the muscle cell?

a)

Sarcoplasm

b)

Sarcolemma

c)

Sarcoplasmic Reticulum

d)

Myoglobin

10.

When all of the sodium channels open in the muscle cell membrane, a(n) ________ is created.

a)

negative charge

b)

resting potential

c)

muscle twitch

d)

impulse

11.

What two chemicals are necessary for muscle contraction to occur?

a)

Sodium and Potassium

b)

Calcium and ATP

c)

Sodium and Phosphate

d)

Acetylcholine and Potassium

12.
Identify one factor that can cause the first sodium channel to open in a muscle cell.  
a)
Calcium ions being released from the sarcoplasmic reticulum.
b)
Acetylcholine being released from the motor neuron
c)
Calcium ions binding to troponin
d)
ATP causing the myosin heads to pop up.  
13.
Region where a motor neuron comes in close contact with a muscle cell.
a)
neurotransmitter
b)
muscular dystrophy
c)
muscle tension
d)
neuromuscular junction
14.
Calcium:
a)
causes ATP binding to actin
b)
increases the action potential along the sarcolemma
c)
binds to proteins on myosin
d)
triggers the binding of myosin to actin
15.

When a muscle fiber contracts, the I bands get smaller in size.

a)

True

b)

False

16.
enzyme that breaks down the muscle cell neurotransmitter and ends the impulse
a)
lactase
b)
sucrase
c)
lipase
d)
acetylcholinterase
17.

Actin filaments are bound to the edges/boundaries of the sarcomere, also known as the...

a)

M-Line

b)

H-Zone

c)

Z-Disc

d)

A-Band

18.

The muscle cell membrane is called the...

a)

myolemma

b)

sarcoplasm

c)

epimyisum

d)

sarcolemma

19.

The energy for muscle contraction is supplied by which of the following organelles?

a)

sacroplasmic reticulum

b)

mitochondria

c)

ribosomes

d)

myosin

20.
Concerning the Cross Bridge Cycle, When ADP leaves the myosin head, the ________
a)
the myosin head goes into the cocked or ready position
b)
myosin head pulls on the actin and the sarcomere shortens
c)
The myosin head enters the high energy state and only binds to the actin filament
d)
the myosin head enters the low energy state
21.

Which of the following prevents myosin from binding to the actin in a "resting"/relaxed muscle fiber?

a)

ATP molecules prevent calcium from binding to troponin

b)

calcium ion block actin binding sites on the myosin heads

c)

the troponin-tropomyosin complex covers the myosin-binding sites on the thin filaments

d)

actin forms cross bridges with myosin, preventing tropomyosin from sliding over troponin

22.
A motor unit is made up of _______________.
a)
all the muscle fibers within a given muscle
b)
a motor neuron and the muscle fibers it innervates
c)
all the neurons going into an individual section of the body
d)
a fascicle and a nerve
23.

The H zone is represented by number...

a)

1

b)

2

c)

6

d)

7

24.

The A band is represented by number...

a)

1

b)

2

c)

5

d)

6

25.

Myosin is represented by number...

a)

3

b)

4

c)

5

d)

8

26.

The I band is represented by...

a)

4

b)

5

c)

6

d)

7

27.

Which of the following stores calcium in a muscle cell?

a)

sarcoplasm

b)

sarcoplasmic reticulum

c)

myolemma

d)

endomysium

28.

Which of the following ends the sarcomere contraction?

a)

calcium ions are pumped back into the SR, moving the troponin-tropomyosin complex back over the actin binding sites

b)

sodium ions leave the muscle cell, preventing myosin from binding to actin

c)

ACh attaches to receptors in the sarcolemma, stopping sarcomere contraction

d)

calcium ions bind directly to the myosin heads, preventing them from attaching to the thin filaments

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