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

1. Introduction to Anatomy & Physiology

What is Anatomy & Physiology?

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

What is Anatomy & Physiology?

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Multiple Choice

Which of the following best defines an antagonist muscle?

A muscle that initiates the movement of a joint

A muscle that opposes the action of a prime mover

A muscle that remains stationary during movement

A muscle that assists the action of a prime mover

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Verified step by step guidance

Step 1: Begin by understanding the concept of muscle roles during movement. Muscles work in pairs to create movement, and their roles are categorized as prime movers, antagonists, synergists, and fixators.

Step 2: Define the term 'antagonist muscle.' An antagonist muscle is one that opposes the action of the prime mover (also known as the agonist). When the prime mover contracts to produce movement, the antagonist muscle relaxes or lengthens to allow the movement to occur smoothly.

Step 3: Compare the definitions provided in the options. For example, 'A muscle that initiates the movement of a joint' describes the prime mover, not the antagonist. Similarly, 'A muscle that remains stationary during movement' refers to stabilizing muscles, and 'A muscle that assists the action of a prime mover' describes a synergist.

Step 4: Identify the correct definition from the options. The correct answer is 'A muscle that opposes the action of a prime mover,' as this aligns with the definition of an antagonist muscle.

Step 5: Reflect on the importance of antagonist muscles in coordinated movement. They prevent excessive movement and help maintain joint stability by balancing the action of the prime mover.