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

27. The Reproductive System

Introduction to the Reproductive System

Anatomy & Physiology

27. The Reproductive System

Introduction to the Reproductive System

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Multiple Choice

Erection of the penis results from ________.

sympathetic stimulation of penile veins

inhibition of testosterone production

contraction of the detrusor muscle

parasympathetic stimulation of penile arterioles

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Verified step by step guidance

Understand the physiological process of erection: Erection of the penis is primarily a vascular event controlled by the autonomic nervous system. It involves increased blood flow to the penile tissues, specifically the corpora cavernosa, leading to engorgement and rigidity.

Identify the role of the parasympathetic nervous system: The parasympathetic nervous system is responsible for vasodilation (widening of blood vessels) in the penile arterioles. This occurs through the release of nitric oxide (NO), which relaxes smooth muscle in the vessel walls.

Eliminate incorrect options: Sympathetic stimulation of penile veins would lead to vasoconstriction and reduced blood flow, which is counterproductive to erection. Inhibition of testosterone production does not directly affect the vascular mechanisms of erection. Contraction of the detrusor muscle is related to bladder function, not penile erection.

Focus on the correct mechanism: Parasympathetic stimulation of penile arterioles increases blood flow to the penis, causing the corpora cavernosa to fill with blood and resulting in an erection.

Summarize the key concept: Erection is a parasympathetic-driven process involving vasodilation of penile arterioles, mediated by nitric oxide, which facilitates increased blood flow and engorgement of erectile tissues.