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

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

Anatomy & Physiology

9. Muscle Tissue

Introduction to Muscles and Muscle Tissue

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Multiple Choice

Which best describes the primary action of the biceps brachii muscle?

Abduction of the arm at the shoulder

Flexion of the forearm at the elbow

Adduction of the arm at the shoulder

Extension of the forearm at the elbow

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Verified step by step guidance

Step 1: Begin by identifying the anatomical location and structure of the biceps brachii muscle. The biceps brachii is a two-headed muscle located in the anterior compartment of the upper arm, spanning from the scapula to the radius.

Step 2: Understand the primary function of the biceps brachii. Its main action is flexion of the forearm at the elbow joint, as it contracts to bring the forearm closer to the upper arm.

Step 3: Recognize the secondary actions of the biceps brachii. It also assists in supination of the forearm (rotating the forearm so the palm faces upward) and plays a minor role in stabilizing the shoulder joint.

Step 4: Eliminate incorrect options based on the muscle's function. Abduction and adduction of the arm at the shoulder involve different muscles, such as the deltoid and pectoralis major, respectively. Extension of the forearm at the elbow is performed by the triceps brachii, not the biceps brachii.

Step 5: Conclude that the correct description of the primary action of the biceps brachii is flexion of the forearm at the elbow, as this is its most prominent and well-known function.