Table of contents

1. Introduction to Anatomy & Physiology5h 43m
2. Cell Chemistry & Cell Components12h 36m
3. Energy & Cell Processes10h 6m
4. Tissues & Histology10h 3m
5. Integumentary System2h 20m
6. Bones & Skeletal Tissue2h 16m
7. The Skeletal System2h 35m
8. Joints2h 17m
9. Muscle Tissue2h 33m
10. Muscles1h 11m
11. Nervous Tissue and Nervous System1h 35m
12. The Central Nervous System1h 6m
- Introduction to the Central Nervous System
  18m
- The Cerebrum
  48m
13. The Peripheral Nervous System1h 26m
14. The Autonomic Nervous System1h 38m
15. The Special Senses2h 41m
16. The Endocrine System2h 48m
17. The Blood3h 22m
18. The Heart3h 42m
19. The Blood Vessels3h 35m
20. The Lymphatic System3h 16m
21. The Immune System14h 37m
22. The Respiratory System3h 20m
23. The Digestive System2h 5m
24. Metabolism and Nutrition4h 0m
25. The Urinary System2h 39m
26. Fluid and Electrolyte Balance, Acid Base Balance37m
27. The Reproductive System2h 5m
28. Human Development1h 21m
29. Heredity3h 32m

10. Muscles

Muscle Actions

Anatomy & Physiology

10. Muscles

Muscle Actions

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Multiple Choice

When does a muscle perform an action, during contraction or relaxation?

Only when both contracting and relaxing

Neither contracting nor relaxing

During relaxation

During contraction

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Verified step by step guidance

Understand the basic physiology of muscle action: Muscles perform actions by contracting, which involves the shortening of muscle fibers to produce movement.

Recognize that muscle contraction is an active process requiring energy, primarily in the form of ATP, to facilitate the interaction between actin and myosin filaments within the muscle cells.

Differentiate between contraction and relaxation: Contraction is the phase where muscles generate force and perform work, while relaxation is the phase where muscles return to their resting state and do not perform work.

Identify that during contraction, muscles pull on bones or other structures to create movement, such as lifting a weight or bending a joint.

Conclude that the action of a muscle, in terms of performing work or movement, occurs during the contraction phase, as this is when the muscle exerts force.