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 statements about the proximal convoluted tubule of the mammalian kidney is accurate?

It is primarily responsible for reabsorbing water, ions, and nutrients from the filtrate.

It is the main site of urine concentration through the action of antidiuretic hormone (ADH).

It is located in the renal medulla.

It secretes renin directly into the bloodstream.

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Verified step by step guidance

Step 1: Begin by identifying the anatomical location and function of the proximal convoluted tubule (PCT) within the nephron. The PCT is located in the renal cortex, not the renal medulla, and is the first segment of the nephron after the glomerulus.

Step 2: Understand the primary role of the PCT. It is responsible for reabsorbing water, ions (such as sodium and chloride), and nutrients (like glucose and amino acids) from the filtrate back into the bloodstream. This process is essential for maintaining homeostasis.

Step 3: Clarify the role of antidiuretic hormone (ADH). ADH primarily acts on the collecting ducts and distal convoluted tubules to concentrate urine, not the PCT. Therefore, the PCT is not the main site of urine concentration through ADH action.

Step 4: Examine the secretion of renin. Renin is secreted by the juxtaglomerular cells of the kidney, not the PCT. The PCT does not directly secrete renin into the bloodstream.

Step 5: Based on the above clarifications, the accurate statement about the PCT is that it is primarily responsible for reabsorbing water, ions, and nutrients from the filtrate. This aligns with its physiological function in the nephron.