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

What is one example of an antagonist pair of muscles?

Rectus abdominis and erector spinae

Quadriceps femoris and hamstrings

Biceps brachii and triceps brachii

Gastrocnemius and soleus

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Verified step by step guidance

Understand the concept of antagonist muscles: Antagonist muscles are pairs of muscles that work against each other to move a joint. When one muscle contracts, the other muscle relaxes, allowing movement in the opposite direction.

Identify the function of each muscle in the pair: For example, the biceps brachii is responsible for flexing the elbow, while the triceps brachii extends the elbow.

Recognize the anatomical location: The biceps brachii is located in the upper arm, on the front side, while the triceps brachii is located on the back side of the upper arm.

Consider the movement involved: When the biceps brachii contracts, it bends the elbow, and when the triceps brachii contracts, it straightens the elbow. This opposing action is characteristic of an antagonist pair.

Apply this understanding to other muscle pairs: Use the same principles to analyze other muscle pairs, such as the quadriceps femoris and hamstrings, which work together to flex and extend the knee.