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

Introduction to the Urinary System

Anatomy & Physiology

25. The Urinary System

Introduction to the Urinary System

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Multiple Choice

The mechanism for producing a concentrated urine involves all of the following except:

Secretion of antidiuretic hormone (ADH)

High permeability of the collecting duct to water

Increased glomerular filtration rate

Active transport of sodium in the ascending limb of the nephron loop

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Verified step by step guidance

Step 1: Understand the mechanism of producing concentrated urine. Concentrated urine is formed when the body conserves water, primarily through the action of antidiuretic hormone (ADH), which increases water reabsorption in the collecting ducts.

Step 2: Review the role of ADH. ADH makes the collecting ducts highly permeable to water, allowing water to be reabsorbed into the bloodstream, thereby concentrating the urine.

Step 3: Examine the role of the nephron loop (loop of Henle). The ascending limb of the nephron loop actively transports sodium ions (Na+) out of the tubular fluid, creating a concentration gradient in the medulla that facilitates water reabsorption in the descending limb and collecting ducts.

Step 4: Analyze the impact of glomerular filtration rate (GFR). An increased GFR would result in a higher volume of filtrate entering the nephron, which could dilute the urine rather than concentrate it. This is why increased GFR is not part of the mechanism for producing concentrated urine.

Step 5: Conclude that the correct answer is 'Increased glomerular filtration rate,' as it does not contribute to the production of concentrated urine, unlike the other listed mechanisms.