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

Renal Physiology: Overview

Anatomy & Physiology

25. The Urinary System

Renal Physiology: Overview

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Multiple Choice

Which of the following occurs during the processing of filtrate in the proximal and distal tubules of the nephron?

Storage of urine before excretion

Production of erythropoietin

Selective reabsorption of water, ions, and nutrients

Filtration of blood plasma from the glomerulus

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Verified step by step guidance

Understand the structure and function of the nephron: The nephron is the functional unit of the kidney, responsible for filtering blood and forming urine. It consists of several parts, including the glomerulus, proximal tubule, distal tubule, loop of Henle, and collecting duct.

Identify the role of the proximal tubule: The proximal tubule is primarily responsible for selective reabsorption of water, ions (such as sodium and potassium), and nutrients (like glucose and amino acids) from the filtrate back into the bloodstream. This process helps maintain homeostasis and prevents the loss of essential substances.

Understand the role of the distal tubule: The distal tubule also participates in selective reabsorption and secretion. It fine-tunes the reabsorption of ions and water based on the body's needs, under the influence of hormones like aldosterone and antidiuretic hormone (ADH).

Differentiate between filtration and reabsorption: Filtration occurs in the glomerulus, where blood plasma is filtered into the nephron to form the initial filtrate. Reabsorption, on the other hand, occurs in the proximal and distal tubules, where essential substances are selectively taken back into the bloodstream.

Clarify why the other options are incorrect: Storage of urine occurs in the bladder, not the tubules. Production of erythropoietin, a hormone that stimulates red blood cell production, occurs in the kidneys but is not related to the nephron's tubules. Filtration of blood plasma occurs in the glomerulus, not the proximal or distal tubules.