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

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

Anatomy & Physiology

1. Introduction to Anatomy & Physiology

Introduction to Organ Systems

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Multiple Choice

Which structure in the human body acts as a countercurrent exchanger to maintain homeostasis?

Loop of Henle

Thyroid gland

Alveoli

Sinoatrial node

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Verified step by step guidance

Understand the concept of countercurrent exchange: This is a mechanism that allows for efficient transfer of substances (such as heat or solutes) between two fluids flowing in opposite directions. It is crucial for maintaining homeostasis in various physiological systems.

Identify the role of the Loop of Henle: The Loop of Henle is a structure in the nephron of the kidney that plays a key role in concentrating urine and conserving water. It uses a countercurrent multiplier system to create a concentration gradient in the medulla of the kidney.

Explore the anatomy of the Loop of Henle: The Loop of Henle consists of a descending limb and an ascending limb. The descending limb is permeable to water but not to solutes, while the ascending limb is permeable to solutes but not to water.

Examine how the Loop of Henle functions as a countercurrent exchanger: As fluid flows down the descending limb, water is reabsorbed into the surrounding tissue, concentrating the solutes. As fluid ascends the ascending limb, solutes are reabsorbed, further concentrating the urine.

Conclude why the Loop of Henle is the correct answer: The Loop of Henle's countercurrent mechanism is essential for the kidney's ability to concentrate urine and maintain water and electrolyte balance, which is a critical aspect of homeostasis.