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

The Nephron

Anatomy & Physiology

25. The Urinary System

The Nephron

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Multiple Choice

Macula densa cells monitor the ________ concentration of the filtrate.

$H_2O$

$Na^+$

$NaCl$

$Ca^2$ $^+$

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Verified step by step guidance

Understand the role of macula densa cells: These cells are part of the juxtaglomerular apparatus in the kidney and play a crucial role in regulating blood pressure and the filtration rate of the glomerulus.

Identify the primary function of macula densa cells: They detect changes in the concentration of certain ions in the filtrate, which is the fluid that passes through the nephron in the kidney.

Focus on the specific ion concentration monitored by macula densa cells: These cells are sensitive to the concentration of sodium chloride (NaCl) in the filtrate.

Consider the physiological response: When the macula densa cells detect low NaCl concentration, they signal for adjustments in the glomerular filtration rate to maintain homeostasis.

Conclude that the correct answer is NaCl, as macula densa cells specifically monitor the sodium chloride concentration in the filtrate to regulate kidney function.