Skeletal Muscle Physiology
Explore the structure, function, and contraction mechanisms of skeletal muscle at a Grade 12 level.
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Skeletal Muscle Physiology
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Date:
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Read each question carefully and answer to the best of your ability. Refer to the provided diagrams where applicable.
1. Which of the following is the functional unit of skeletal muscle contraction?
Myofibril
Sarcomere
Muscle fiber
Fascicle
2. What role does calcium play in muscle contraction?
Binds to myosin, initiating cross-bridge formation
Blocks active sites on actin
Binds to troponin, exposing active sites on actin
Provides energy for muscle contraction
3. The sliding filament model of muscle contraction describes how filaments slide past filaments.
4. The neurotransmitter released at the neuromuscular junction is .
5. Briefly explain the role of ATP in the cross-bridge cycle.
6. Label the following components on the provided diagram of a muscle fiber cross-section:
A.
B.
C.
D.
7. Skeletal muscle cells are multinucleated.
True
False
8. The sarcoplasmic reticulum stores and releases sodium ions.
True
False
9. Describe the sequence of events, starting from a nerve impulse, that leads to skeletal muscle contraction. Include the roles of the neuromuscular junction, sarcoplasmic reticulum, and the sliding filament model.