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

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Which layer of the alimentary canal is responsible for segmentation and peristalsis?

Submucosa

Muscularis externa

Serosa

Mucosa

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Verified step by step guidance

Step 1: Understand the structure of the alimentary canal. The alimentary canal consists of four main layers: mucosa, submucosa, muscularis externa, and serosa. Each layer has specific functions related to digestion and movement of food.

Step 2: Define segmentation and peristalsis. Segmentation refers to localized contractions that mix food with digestive enzymes, while peristalsis involves wave-like contractions that propel food through the digestive tract.

Step 3: Identify the layer responsible for these movements. The muscularis externa is the layer of the alimentary canal that contains smooth muscle responsible for both segmentation and peristalsis.

Step 4: Examine the structure of the muscularis externa. It typically consists of two layers of smooth muscle: an inner circular layer and an outer longitudinal layer. These layers work together to produce the movements necessary for digestion.

Step 5: Compare the muscularis externa to other layers. The mucosa is involved in secretion and absorption, the submucosa provides support and contains blood vessels, and the serosa is the outermost protective layer. None of these layers are directly responsible for segmentation and peristalsis.