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

Why doesn't semen enter the urinary bladder during ejaculation?

The prostate gland secretes a barrier that blocks the bladder.

The detrusor muscle contracts to seal off the bladder.

The external urethral sphincter contracts to block the bladder opening.

The internal urethral sphincter closes to prevent backflow into the bladder.

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Verified step by step guidance

Understand the anatomy of the male reproductive system, specifically the role of the internal urethral sphincter, which is located at the junction of the bladder and the urethra.

Learn about the physiological process of ejaculation, which involves the coordination of muscles and sphincters to ensure the proper flow of semen through the urethra.

Recognize that during ejaculation, the internal urethral sphincter contracts to prevent retrograde flow of semen into the urinary bladder. This is a protective mechanism to ensure semen exits the body properly.

Differentiate the internal urethral sphincter from other structures like the external urethral sphincter, which controls voluntary urination, and the detrusor muscle, which is involved in bladder contraction during urination.

Conclude that the internal urethral sphincter plays a critical role in preventing the mixing of semen and urine by closing off the bladder during ejaculation, ensuring the reproductive and urinary systems function independently.