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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

2. Cell Chemistry & Cell Components

Passive vs. Active Transport

Anatomy & Physiology

2. Cell Chemistry & Cell Components

Passive vs. Active Transport

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Multiple Choice

Which of the following statements best describes the movement of sodium and potassium ions across the plasma membrane?

Both sodium and potassium ions move into the cell through facilitated diffusion.

Potassium ions are actively transported out of the cell while sodium ions are actively transported into the cell by the sodium-potassium pump.

Sodium ions move into the cell while potassium ions move out of the cell through passive diffusion.

Sodium ions are actively transported out of the cell while potassium ions are actively transported into the cell by the sodium-potassium pump.

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Verified step by step guidance

Understand the role of the sodium-potassium pump in maintaining cellular homeostasis. This pump is crucial for regulating ion concentration across the plasma membrane.

Recognize that the sodium-potassium pump is an example of active transport, which requires energy in the form of ATP to move ions against their concentration gradients.

Identify the specific movement of ions: the pump actively transports sodium ions (Na⁺) out of the cell and potassium ions (K⁺) into the cell.

Note that this process is essential for maintaining the electrochemical gradient, which is vital for various cellular functions, including nerve impulse transmission and muscle contraction.

Understand that facilitated diffusion and passive diffusion do not require energy and involve movement along the concentration gradient, which is not the case for the sodium-potassium pump.