Muscle Structure & Function
This worksheet covers the basic structure and function of muscle tissue, including the sliding filament model and types of muscle.
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Muscle Structure & Function Worksheet
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Read each question carefully and provide clear, concise answers. For multiple-choice questions, select the best option. For fill-in-the-blank questions, complete the sentence with the correct term. For short-answer questions, use the provided lines.
1. Which of the following is the smallest contractile unit of a skeletal muscle?
Muscle fiber
Myofibril
Sarcomere
Fascicle
2. The primary protein component of thick filaments in a sarcomere is:
Actin
Myosin
Troponin
Tropomyosin
3. The is the plasma membrane of a muscle fiber.
4. During muscle contraction, the thin filaments slide past the thick filaments, causing the to shorten.
5. Calcium ions are stored in the within a muscle cell.
6. Briefly explain the role of ATP in muscle contraction and relaxation.
7. Refer to the diagram below showing a cross-section of a muscle fiber. Label the indicated structures.
A.
B.
C.
D.
Match the muscle type with its characteristic.
8. Skeletal muscle
a. Involuntary, striated, branched cells
9. Cardiac muscle
b. Voluntary, striated, multinucleated cells
10. Smooth muscle
c. Involuntary, non-striated, single nucleus
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