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Muscle Contraction

Total questions: 26

Worksheet time: 19mins

Name
Class
Date
1.
A is pointing to?
a)
Sarcomere 
b)
Z disk
c)
A band
d)
I band
2.
B is pointing to?
a)
Sarcomere 
b)
Z disk
c)
A band
d)
I band
3.
C is pointing to?
a)
H zone
b)
Z disk
c)

A band

d)
I band
4.
D is pointing to?
a)

Myosin

b)
Z disk
c)

Actin

d)
I band
5.
E is pointing to?
a)
H zone
b)
Z disk
c)
A band
d)
I band
6.
F is pointing to?
a)
H zone
b)
Actin
c)
A band
d)

I band

7.

G is pointing to?

a)

Myosin

b)
Actin
c)
A band
d)

I band

8.
the __ zone of a sarcomere contains no actin filaments while the skeletal muscle is at rest
a)
H
b)
Z
c)
synaptic cleft
d)
sarcomere
9.
when skeletal muscle is fully contracted, the __ are closer to the thick filament
a)
H
b)
Z
c)
synaptic cleft
d)
sarcomere
10.

the gap between the motor neuron and the muscle fiber it supplies at the neuromuscular junction

a)

H

b)

Z

c)

synaptic cleft

d)

sarcomere

11.
tiny chains of contractile units between 2 Z disks, which are aligned end to end
a)
H
b)
Z
c)
synaptic cleft
d)
sarcomere
12.
a neurotransmitter that stimulates skeletal muscles
a)

acetylcholine (ACh)

b)
ATP
c)
cross bridges
d)
neuromuscular junction
13.
the only energy source that can be used to directly power muscle activity
a)

acetylcholine (ACh)

b)
ATP
c)
cross bridges
d)
neuromuscular junction
14.
the heads of the myosin myofilaments are called __ when they link the thick and the thin filament together 
a)
acetylcholine (Ach)
b)
ATP
c)
cross bridges
d)
neuromuscular junction
15.
point where an axon terminals of a nerve cell and the sarcolemma of a skeletal muscle join
a)

acetylcholine (ACh)

b)
ATP
c)
cross bridges
d)
neuromuscular junction
16.
plasma membrane of a muscle cell
a)
sarcolemma
b)
sarcoplasmic reticulum
c)
thick filament
d)
thin filament
17.
specialized smooth endoplasmic reticulum that surrounds each myofibril, it stores calcium and releases on demand
a)
sarcolemma
b)
sarcoplasmic reticulum
c)
thick filament
d)
thin filament
18.
myosin protein
a)
sarcolemma
b)
sarcoplasmic reticulum
c)
thick filament
d)
thin filament
19.
actin, contractile protein
a)
sarcolemma
b)
sarcoplasmic reticulum
c)
thick filament
d)
thin filament
20.
what is the function of Calcium during a skeletal muscle contraction?
a)
connecting to H zone
b)
connecting to troponin
c)
connecting to myofibril
d)
connecting to myosin
21.
What causes the force of the contraction?
a)
acetylcholine
b)
myosin moving 
c)
Calcium
d)
actin moving
22.

Reorder the following

a)

Fascicle

b)

Muscle fiber

c)

Myofibril

d)

Sarcomere

e)

Myofilament

1)
2)
3)
4)
5)
23.

Reorder the following contraction steps 1-5

a)

Resting state

b)

nerve action potential

c)

ACh released

d)

Action potential transmitted

e)

Ca++ released

1)
2)
3)
4)
5)
24.

Reorder the following contraction steps 6-10

a)

Ca ++ bound

b)

Myosin activated

c)

Tropomyosin shift

d)

crossbridge formation

e)

Repeat formation

1)
2)
3)
4)
5)
25.

Reorder the following relaxation steps 1-4

a)

ACh breakdown

b)

T-tubules repolarize

c)

Ca++ pump activated

d)

crossbridge terminated

1)
2)
3)
4)
26.

Reorder the following relaxation steps 5-8

a)

Return of tropomyosin

b)

Mg++ formed with ATP

c)

Passive sliding

d)

Return to resting state

1)
2)
3)
4)

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