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

1. Introduction to Anatomy & Physiology

Anatomical Terms for the Head and Neck

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Anatomical Terms for the Head and Neck

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Multiple Choice

Which muscle is primarily responsible for closing the jaw during mastication?

Masseter

Orbicularis oculi

Frontalis

Sternocleidomastoid

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Verified step by step guidance

Step 1: Understand the function of mastication (chewing) and identify the muscles involved. Mastication requires the movement of the jaw to break down food, and specific muscles are responsible for closing the jaw.

Step 2: Review the anatomy of the jaw and the muscles associated with its movement. The primary muscles involved in mastication include the masseter, temporalis, and medial pterygoid muscles.

Step 3: Focus on the masseter muscle. The masseter is one of the strongest muscles in the body and is primarily responsible for elevating (closing) the mandible during mastication.

Step 4: Compare the listed options: Orbicularis oculi is responsible for closing the eyelids, frontalis is involved in raising the eyebrows, and sternocleidomastoid is responsible for head and neck movement. None of these muscles are involved in jaw closure.

Step 5: Conclude that the masseter muscle is the correct answer because it is anatomically and functionally responsible for closing the jaw during mastication.