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

Which of the following is an example of antagonistic muscle action?

Quadriceps and hamstrings during knee extension

Gastrocnemius and soleus during plantar flexion

Biceps brachii and triceps brachii during elbow flexion and extension

Deltoid and pectoralis major during shoulder abduction

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Verified step by step guidance

Understand the concept of antagonistic muscle action: Antagonistic muscles are pairs of muscles that work opposite to each other. When one muscle contracts, the other muscle relaxes, allowing movement in opposite directions.

Identify the muscle pairs in the options: Quadriceps and hamstrings, Gastrocnemius and soleus, Biceps brachii and triceps brachii, Deltoid and pectoralis major.

Analyze the function of each muscle pair: Quadriceps and hamstrings are involved in knee extension and flexion, respectively. Gastrocnemius and soleus both contribute to plantar flexion. Biceps brachii and triceps brachii are responsible for elbow flexion and extension. Deltoid and pectoralis major are involved in shoulder abduction and adduction.

Determine which muscle pair exhibits antagonistic action: Antagonistic action is seen when one muscle contracts to perform an action while the other muscle relaxes to allow the opposite action. Biceps brachii and triceps brachii are classic examples, as they perform opposite actions at the elbow joint.

Conclude that the correct example of antagonistic muscle action is the biceps brachii and triceps brachii during elbow flexion and extension, as they work in opposition to each other to control movement at the elbow.