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

23. The Digestive System

Introduction to the Digestive System

Anatomy & Physiology

23. The Digestive System

Introduction to the Digestive System

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Multiple Choice

Which of the following lists the correct order of the digestive tract in earthworms?

Mouth → Pharynx → Esophagus → Crop → Gizzard → Intestine → Anus

Mouth → Esophagus → Pharynx → Gizzard → Crop → Intestine → Anus

Mouth → Crop → Gizzard → Pharynx → Esophagus → Intestine → Anus

Mouth → Gizzard → Crop → Esophagus → Pharynx → Intestine → Anus

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Verified step by step guidance

Step 1: Begin by understanding the anatomy of the earthworm's digestive system. Earthworms have a specialized digestive tract that processes food sequentially through various organs, each with a specific function.

Step 2: Identify the correct sequence of organs based on their roles. Food enters the mouth, then moves to the pharynx, which helps in swallowing. The esophagus transports food to the crop, where it is stored temporarily.

Step 3: From the crop, food moves to the gizzard, where it is mechanically ground. This grinding process is essential for breaking down food particles before chemical digestion.

Step 4: After the gizzard, food passes into the intestine, where nutrients are absorbed. The intestine is the primary site for digestion and absorption in earthworms.

Step 5: Finally, undigested waste is expelled through the anus. This completes the digestive process in earthworms. Compare the given options to match this sequence: Mouth → Pharynx → Esophagus → Crop → Gizzard → Intestine → Anus.