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

Why do water and small molecules move from the glomerulus into the filtrate during glomerular filtration?

Due to the high hydrostatic pressure in the glomerular capillaries

As a result of the osmotic pressure created by plasma proteins in the filtrate

Because of the active transport mechanisms in the glomerular membrane

Due to the low blood pressure in the afferent arteriole

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Verified step by step guidance

Understand the process of glomerular filtration, which occurs in the kidneys and is the first step in urine formation. It involves the movement of water and small molecules from the blood in the glomerulus into the filtrate in Bowman's capsule.

Recognize that the driving force for glomerular filtration is primarily the hydrostatic pressure in the glomerular capillaries. This pressure is higher than the pressure in Bowman's capsule, facilitating the movement of substances into the filtrate.

Consider the role of osmotic pressure. Plasma proteins in the blood create an osmotic pressure that opposes filtration, but the hydrostatic pressure is typically greater, allowing filtration to occur.

Note that active transport mechanisms are not involved in the initial movement of water and small molecules during glomerular filtration. This process is passive and driven by pressure gradients.

Identify the role of blood pressure in the afferent arteriole. The pressure here is relatively high, contributing to the high hydrostatic pressure in the glomerular capillaries, which is crucial for effective filtration.