Grade 12 Biology: The Muscular System
Explore the structure, function, and types of muscles in the human body with this comprehensive Grade 12 biology worksheet.
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Grade 12 Biology: The Muscular System
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Read each question carefully and answer to the best of your ability. Refer to your knowledge of the human muscular system.
1. Which of the following muscle types is voluntary and striated?
Smooth muscle
Cardiac muscle
Skeletal muscle
All of the above
2. The sliding filament model of muscle contraction describes the interaction between which two proteins?
Collagen and elastin
Actin and myosin
Troponin and tropomyosin
Keratin and melanin
3. The primary function of the muscular system is .
4. A muscle fiber is also known as a .
5. The neurotransmitter responsible for muscle contraction at the neuromuscular junction is .
6. Briefly explain the difference between isotonic and isometric muscle contractions.
7. Describe the role of ATP in muscle contraction and relaxation.
8. Label the major muscles indicated in the diagram below.
A.
B.
C.
D.
E.
F.
9. Cardiac muscle is found in the walls of internal organs and is involuntary.
True
False
10. Rigor mortis occurs because ATP is not available to release the myosin heads from actin.
True
False
11. Discuss the hierarchical organization of skeletal muscle, from the entire muscle down to the myofilaments. Include the roles of connective tissues and the sarcoplasmic reticulum.
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