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 Heart2h 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

The Nephron

Anatomy & Physiology

25. The Urinary System

The Nephron

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Multiple Choice

Which of the following statements best describes the role of the juxtamedullary nephrons?

Juxtamedullary nephrons filter large volumes of blood to increase urine volume.

Juxtamedullary nephrons play a role in forming concentrated urine.

Juxtamedullary nephrons play a key role in regulating blood pressure.

Juxtamedullary nephrons control $K^+$ and $Ca^2$ $^+$ levels.

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Verified step by step guidance

Understand the structure and function of juxtamedullary nephrons. These nephrons are located near the medulla of the kidney and have long loops of Henle that extend deep into the medulla.

Recognize the primary function of juxtamedullary nephrons. They are crucial for the concentration of urine, allowing the body to conserve water and produce urine that is more concentrated than blood plasma.

Consider the role of the loop of Henle in juxtamedullary nephrons. The long loop of Henle creates a concentration gradient in the medulla, which is essential for water reabsorption and urine concentration.

Evaluate the options given in the problem. The statement that juxtamedullary nephrons play a role in forming concentrated urine aligns with their known function of concentrating urine through the countercurrent multiplication mechanism.

Reflect on the other options. While juxtamedullary nephrons contribute to blood pressure regulation through the renin-angiotensin system, their primary role is in urine concentration. They do not directly control potassium (K+) or calcium (Ca2+) levels.