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

What is the primary effect of the countercurrent multiplier in the loop of Henle?

It increases blood pressure by enhancing sodium reabsorption in the distal tubule.

It dilutes urine by increasing water reabsorption in the proximal tubule.

It concentrates urine by creating a hyperosmotic medullary interstitium.

It decreases glomerular filtration rate by constricting the afferent arteriole.

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Verified step by step guidance

Understand the function of the loop of Henle: The loop of Henle is a part of the nephron in the kidney that plays a crucial role in concentrating urine and conserving water.

Learn about the countercurrent multiplier system: This system involves the interaction between the descending and ascending limbs of the loop of Henle, which creates a gradient of increasing osmolarity in the medullary interstitium.

Recognize the role of the descending limb: The descending limb is permeable to water but not to solutes, allowing water to leave the tubule and enter the medullary interstitium, increasing the concentration of the filtrate.

Identify the function of the ascending limb: The ascending limb is impermeable to water but actively transports sodium and chloride ions out of the tubule into the interstitium, which helps to maintain the osmotic gradient.

Conclude the primary effect: The countercurrent multiplier system effectively concentrates urine by creating a hyperosmotic medullary interstitium, which allows for the reabsorption of water from the collecting ducts under the influence of antidiuretic hormone (ADH).