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 best explains how muscles and bones work together to bend the arm at the elbow?

The humerus bone contracts, causing the biceps to relax and the arm to bend.

The biceps muscle contracts, pulling on the radius bone to bend the arm at the elbow.

The triceps muscle contracts, pushing the ulna bone to bend the arm at the elbow.

The radius and ulna contract together to bend the arm at the elbow.

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Verified step by step guidance

Understand the anatomy of the arm: The elbow joint is a hinge joint formed by the humerus (upper arm bone), radius, and ulna (forearm bones). Muscles like the biceps and triceps are responsible for movement at this joint.

Identify the role of the biceps muscle: The biceps brachii is a flexor muscle located on the front of the upper arm. When it contracts, it pulls on the radius bone, causing the arm to bend at the elbow.

Identify the role of the triceps muscle: The triceps brachii is an extensor muscle located on the back of the upper arm. When it contracts, it straightens the arm by pushing the ulna bone, but it does not contribute to bending the arm.

Clarify why bones do not contract: Bones are rigid structures and cannot contract. Instead, muscles contract to exert force on bones, which act as levers to produce movement.

Conclude that the correct explanation is: The biceps muscle contracts, pulling on the radius bone to bend the arm at the elbow. This is the mechanism by which muscles and bones work together to achieve flexion at the elbow joint.