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

13. The Peripheral Nervous System

Reflex Arcs

Anatomy & Physiology

13. The Peripheral Nervous System

Reflex Arcs

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Multiple Choice

What aspect of the defecation reflex can we consciously control?

The relaxation of the internal anal sphincter

The secretion of digestive enzymes

The contraction of the rectal muscles

The relaxation of the external anal sphincter

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Verified step by step guidance

Understand the defecation reflex: It is a process that involves both involuntary and voluntary actions to expel feces from the body.

Identify the components of the defecation reflex: It includes the relaxation of the internal anal sphincter (involuntary), the contraction of the rectal muscles (involuntary), and the relaxation of the external anal sphincter (voluntary).

Differentiate between involuntary and voluntary control: The internal anal sphincter is controlled by the autonomic nervous system and relaxes involuntarily, while the external anal sphincter is under voluntary control, allowing conscious regulation.

Recognize the role of the external anal sphincter: It is a skeletal muscle that we can consciously contract or relax to control the timing of defecation.

Conclude that the aspect of the defecation reflex we can consciously control is the relaxation of the external anal sphincter, allowing us to decide when to defecate.