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

25. The Urinary System

Renal Physiology: Overview

Anatomy & Physiology

25. The Urinary System

Renal Physiology: Overview

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Multiple Choice

Urination depends on which of the following processes?

Secretion of aldosterone by the adrenal cortex

Contraction of the detrusor muscle and relaxation of the internal urethral sphincter

Inhibition of glomerular filtration

Absorption of water in the proximal convoluted tubule

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Understand the anatomy and physiology of the urinary system, specifically the role of the bladder, detrusor muscle, and urethral sphincters in urination. The detrusor muscle is a smooth muscle in the bladder wall responsible for contraction during urination.

Learn about the internal urethral sphincter, which is composed of smooth muscle and relaxes involuntarily to allow urine to pass from the bladder into the urethra.

Recognize that urination (micturition) is a coordinated process involving the contraction of the detrusor muscle and relaxation of the internal urethral sphincter, both controlled by the autonomic nervous system.

Differentiate this process from other physiological functions mentioned in the options, such as aldosterone secretion (which regulates sodium and water balance), glomerular filtration (which occurs in the kidneys), and water absorption in the proximal convoluted tubule (part of the nephron). These processes are related to urine formation, not urination itself.

Conclude that the correct answer is based on the mechanics of urination, which involve the contraction of the detrusor muscle and relaxation of the internal urethral sphincter, as these are directly responsible for expelling urine from the bladder.