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 Heart2h 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 Step 1: Glomerular Filtration

Anatomy & Physiology

25. The Urinary System

Renal Physiology Step 1: Glomerular Filtration

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Multiple Choice

Which substance would NOT normally be expected in urine?

water

uric acid

sodium

potassium

protein

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Verified step by step guidance

Understand the composition of normal urine: Urine is primarily composed of water, along with various dissolved substances such as urea, uric acid, creatinine, sodium, and potassium. These are waste products filtered from the blood by the kidneys.

Identify the role of proteins in the body: Proteins are large molecules that perform a variety of functions, including acting as enzymes, hormones, and structural components. They are typically retained in the bloodstream and not filtered into the urine under normal conditions.

Consider the filtration process in the kidneys: The kidneys filter blood through structures called nephrons. The glomerulus, a part of the nephron, acts as a sieve, allowing small molecules like water, sodium, and potassium to pass through while retaining larger molecules like proteins.

Recognize conditions that might lead to protein in urine: Proteinuria, the presence of protein in urine, can occur due to kidney damage or disease, which affects the filtration barrier, allowing proteins to pass into the urine.

Conclude why protein is not normally found in urine: Under normal physiological conditions, proteins are too large to pass through the glomerular filtration barrier, hence they are not expected to be present in urine.