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 is the salt level-monitoring part of the nephron?

Proximal convoluted tubule

Macula densa

Loop of Henle

Bowman's capsule

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Verified step by step guidance

Step 1: Understand the role of the nephron in the kidney. The nephron is the functional unit of the kidney responsible for filtering blood, reabsorbing essential substances, and excreting waste products. Different parts of the nephron have specialized functions.

Step 2: Review the function of the macula densa. The macula densa is a group of specialized cells located in the distal convoluted tubule near the glomerulus. These cells monitor the concentration of sodium chloride (NaCl) in the filtrate and play a role in regulating blood pressure and filtration rate.

Step 3: Compare the macula densa to other parts of the nephron. The proximal convoluted tubule is primarily involved in reabsorbing nutrients, water, and ions. The Loop of Henle concentrates urine by reabsorbing water and salts. Bowman's capsule is the site of filtration where blood plasma enters the nephron.

Step 4: Identify the part of the nephron specifically responsible for salt level monitoring. Based on the specialized function of the macula densa in detecting NaCl concentration, it is the correct answer.

Step 5: Conclude that the macula densa is the salt level-monitoring part of the nephron, as it directly senses changes in sodium chloride concentration and signals adjustments to maintain homeostasis.