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

Which of the following best describes juxtamedullary nephrons?

They are responsible for producing dilute urine only.

They lack a vasa recta associated with their structure.

They are located entirely within the renal cortex.

They have long loops of Henle that extend deep into the medulla.

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Verified step by step guidance

Understand the structure and function of juxtamedullary nephrons: These specialized nephrons are located near the boundary between the renal cortex and medulla and play a key role in concentrating urine.

Compare juxtamedullary nephrons to cortical nephrons: Juxtamedullary nephrons have long loops of Henle that extend deep into the medulla, while cortical nephrons have shorter loops of Henle that remain mostly in the cortex.

Recognize the importance of the long loops of Henle: These loops create a concentration gradient in the medulla, which is essential for water reabsorption and the production of concentrated urine.

Clarify the role of the vasa recta: Juxtamedullary nephrons are associated with the vasa recta, a network of capillaries that helps maintain the medullary concentration gradient by facilitating countercurrent exchange.

Eliminate incorrect options: Juxtamedullary nephrons are not responsible for producing only dilute urine, they do not lack a vasa recta, and they are not located entirely within the renal cortex. The correct description is that they have long loops of Henle extending deep into the medulla.