Grade 10 Muscle Structure Worksheet
A Grade 10 science worksheet covering the fundamental structure and function of muscle tissue, including types of muscle, myofibrils, and the sliding filament theory.
Includes
Standards
Topics
Muscle Structure
Name:
Date:
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Read each question carefully and answer to the best of your ability. Refer to your knowledge of muscle structure and function.
1. Which type of muscle tissue is involuntary and found in the walls of internal organs?
Skeletal muscle
Cardiac muscle
Smooth muscle
All of the above
2. What is the primary functional unit of a muscle fiber?
Sarcomere
Myofibril
Muscle fascicle
Tendon
3. The thin filaments in a sarcomere are composed of the protein .
4. The thick filaments in a sarcomere are primarily composed of the protein .
5. The theory that explains how muscle contraction occurs through the interaction of actin and myosin is known as the theory.
6. Briefly describe the role of calcium ions (Ca2+) in muscle contraction.
7. Identify the structures labeled A, B, and C in the following diagram of a muscle fiber cross-section. (Image below)
A:
B:
C:
8. Cardiac muscle is under voluntary control.
True
False
9. A fascicle is a bundle of muscle fibers.
True
False
10. Explain the 'sliding filament theory' of muscle contraction, including the roles of actin, myosin, and ATP.
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