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 Kidneys

Anatomy & Physiology

25. The Urinary System

The Kidneys

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Multiple Choice

The kidneys secrete a hormone that performs which of the following functions?

Enhances calcium absorption in the intestines

Stimulates the production of red blood cells in the bone marrow

Increases blood glucose levels by stimulating glycogenolysis

Regulates blood pressure by promoting sodium retention

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Verified step by step guidance

Identify the hormone secreted by the kidneys that is involved in regulating blood pressure. The kidneys secrete a hormone called renin, which plays a crucial role in this process.

Understand the function of renin. Renin is an enzyme that initiates the renin-angiotensin-aldosterone system (RAAS), which is essential for blood pressure regulation.

Explore how the RAAS system works. Renin converts angiotensinogen, a protein produced by the liver, into angiotensin I. This is then converted into angiotensin II by the enzyme angiotensin-converting enzyme (ACE) in the lungs.

Examine the effects of angiotensin II. Angiotensin II is a potent vasoconstrictor, meaning it narrows blood vessels, increasing blood pressure. It also stimulates the secretion of aldosterone from the adrenal glands.

Understand the role of aldosterone. Aldosterone promotes sodium retention in the kidneys, which leads to water retention, increasing blood volume and, consequently, blood pressure.