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

A muscle that opposes, or reverses, a particular movement is called a(n):

agonist

fixator

antagonist

synergist

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Verified step by step guidance

Step 1: Understand the terminology used in the question. The term 'antagonist' refers to a muscle that opposes or reverses the action of another muscle during movement.

Step 2: Review the roles of other muscle types mentioned in the question: 'agonist' is the primary muscle responsible for a movement, 'synergist' assists the agonist, and 'fixator' stabilizes the origin of the agonist.

Step 3: Relate the concept of 'antagonist' to real-life examples. For instance, during elbow flexion, the biceps brachii acts as the agonist, while the triceps brachii serves as the antagonist by opposing the flexion.

Step 4: Recognize that muscles work in pairs to create smooth and controlled movements. The antagonist muscle ensures balance and prevents excessive motion by opposing the agonist.

Step 5: Apply this understanding to the question and confirm that the correct answer is 'antagonist,' as it matches the definition provided in the problem.