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 muscle is responsible for flexing the forearm at the elbow joint?

Triceps brachii

Biceps brachii

Pectoralis major

Deltoid

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Verified step by step guidance

Step 1: Understand the action described in the question. Flexing the forearm at the elbow joint refers to decreasing the angle between the forearm and the upper arm, which is a movement typically performed by muscles located in the anterior compartment of the arm.

Step 2: Recall the anatomy of the muscles listed in the options. The triceps brachii is located in the posterior compartment of the arm and is responsible for extending the forearm at the elbow joint, not flexing it. The pectoralis major is a chest muscle involved in movements of the shoulder joint, such as adduction and medial rotation of the arm. The deltoid is a shoulder muscle responsible for arm abduction, flexion, and extension at the shoulder joint.

Step 3: Focus on the biceps brachii. This muscle is located in the anterior compartment of the arm and is primarily responsible for flexing the forearm at the elbow joint. It also assists in supination of the forearm (rotating the forearm so the palm faces upward).

Step 4: Consider the functional anatomy of the biceps brachii. The muscle has two heads (long head and short head) that originate from the scapula and insert onto the radius. When the biceps brachii contracts, it pulls on the radius, causing the forearm to flex at the elbow joint.

Step 5: Conclude that the biceps brachii is the correct answer based on its anatomical location and function, as it is the primary muscle responsible for flexing the forearm at the elbow joint.