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

A patient excretes a large volume of very dilute urine on a continuing basis. This may be due to:

decreased glomerular filtration rate

absence of antidiuretic hormone (ADH)

increased reabsorption of water in the collecting ducts

oversecretion of aldosterone

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Verified step by step guidance

Understand the role of antidiuretic hormone (ADH): ADH is responsible for increasing water reabsorption in the kidneys by making the collecting ducts more permeable to water. Its absence leads to the excretion of large volumes of dilute urine.

Analyze the options provided: Evaluate each option based on its physiological impact on urine production. For example, decreased glomerular filtration rate would reduce urine volume, not increase it.

Focus on the absence of ADH: Without ADH, the collecting ducts in the kidneys cannot reabsorb water effectively, leading to dilute urine. This is a key physiological mechanism to consider.

Rule out other options: Increased reabsorption of water in the collecting ducts would result in concentrated urine, not dilute urine. Oversecretion of aldosterone primarily affects sodium reabsorption, not water reabsorption directly.

Conclude that the absence of ADH is the most plausible explanation for the patient's symptoms, as it directly correlates with the production of large volumes of dilute urine.