WorksheetsMuscle Contraction Review
Total questions: 20
Worksheet time: 13mins
Name
Class
Date
1.
Which of these is NOT a phase in the muscle contraction process?
a)
Activation
b)
Excitation-Contraction Coupling
c)
Cross-Bridge Cycle
d)
Elasticity
2.
The location where a muscle fiber and neuron meet is called:
a)
Neuromuscular Junction
b)
Musculoneural Junction
c)
Sarcomere
d)
Motor Neuron
3.
The first phase of a muscle contraction is known as excitation or _____.
a)
Activation
b)
Extensibility
c)
Contractility
d)
Elasticity
4.
Which of these options best summarizes the FIRST phase of a muscle contraction?
a)
A stimulus from the neuron reaches the muscle fiber and stimulates an action potential in the muscle.
b)
The action potential travels along the sarcolemma and penetrates into the muscle fiber. Calcium is released by the SR and travels to the sarcomere.
c)
The cross bridge cycle occurs after calcium is released by the SR. During this cycle, the actin myofilaments are pulled towards the M line by the myosin myofilaments.
5.
An action potential is:
a)
an electrical signal sent in neurons and muscle fibers used to transmit messages.
b)
an electrical signal sent only in muscle fibers used to create a contraction.
c)
a property of muscle fibers that allows contraction to occur.
d)
a specialized structure found within the muscle fiber that is used for contraction.
6.
During the first phase of a muscle contraction, which ion enters into the axon terminal of the neuron?
a)
Calcium
b)
Sodium
c)
Phosphorus
d)
Potassium
7.
During the first phase of contraction, what leaves the neuron and binds to the muscle fiber?
a)
A neurotransmitter called Acetylcholine (ACh)
b)
Calcium ions
c)
Sodium ions
d)
An action potential
8.
The second phase of a muscle contraction is known as:
a)
Activation
b)
Excitation-Contraction Coupling
c)
The Cross-Bridge Cycle
9.
Which of these options best summarizes the SECOND phase of a muscle contraction?
a)
A stimulus from the neuron reaches the muscle fiber and stimulates an action potential in the muscle.
b)
The action potential travels along the sarcolemma and penetrates into the muscle fiber. Calcium is released by the SR and travels to the sarcomere.
c)
The cross bridge cycle occurs after calcium is released by the SR. During this cycle, the actin myofilaments are pulled towards the M line by the myosin myofilaments.
10.
Where is calcium stored in a muscle fiber?
a)
Sarcolemma
b)
Sarcoplasmic Reticulum
c)
T-tubule
d)
Sarcomere
11.
The last step of phase 2 of a muscle contraction, where myosin attaches to actin, is the same as the first step of phase 3 of a muscle contraction.
a)
True
b)
False
12.
What ions are released from the Sarcoplasmic Reticulum during the second phase of a muscle contraction?
a)
Calcium
b)
Potassium
c)
Sodium
d)
Phophorus
13.
Which of these options best summarizes the THIRD and final phase of a muscle contraction?
a)
A stimulus from the neuron reaches the muscle fiber and stimulates an action potential in the muscle.
b)
The action potential travels along the sarcolemma and penetrates into the muscle fiber. Calcium is released by the SR and travels to the sarcomere.
c)
The cross bridge cycle occurs after calcium is released by the SR. During this cycle, the actin myofilaments are pulled towards the M line by the myosin myofilaments.
14.
The third and final phase of a muscle contraction is known as
a)
Activation
b)
Excitation-Contraction Coupling
c)
The Cross-Bridge Cycle
15.
What is needed to ensure phase 3 of a muscle contraction is completed?
a)
ATP
b)
Action potential
c)
Acetylcholine (ACh)
d)
Acetylcholinesterase
16.
Which of the following does NOT change during muscle contraction?
a)
H zones disappear
b)
Z discs move closer together
c)
Sarcomeres shorten
d)
A bands shorten
17.
The following are all functions of the muscular system EXCEPT:
a)
Maintaining posture
b)
Generating body heat
c)
Stabilizing joints
d)
Producing red blood cells (hematopoiesis)
18.
What is the smallest contractile unit of a muscle fiber?
a)
Sarcomere
b)
Sarcolemma
c)
Sarcoplasmic Reticulum
d)
Sarcoplasm
19.
Alternating A and I bands produce striations in skeletal muscle fibers.
a)
True
b)
False
20.
Muscle fibers are surrounded by connective tissue coverings. Which option correctly lists these from the outside to the inside?
a)
Endomysium - Perimysium - Epimysium
b)
Epimysium - Endomysium - Perimysium
c)
Endomysium - Epimysium - Perimysium
d)
Epimysium - Perimysium - Endomysium
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