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

11. Nervous Tissue and Nervous System

Ions - Sodium and Potassium

Anatomy & Physiology

11. Nervous Tissue and Nervous System

Ions - Sodium and Potassium

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Multiple Choice

Relative to extracellular fluid, the interior of a neuron has a negative charge because __________.

potassium diffuses out of the cell

potassium is actively pumped out of the cell

potassium is actively pumped into the cell

chloride ions are actively pumped into the cell

sodium is actively pumped into the cell

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Verified step by step guidance

Understand the concept of membrane potential: Neurons maintain a difference in charge between the inside and outside of the cell, known as the membrane potential. This is crucial for the function of neurons in transmitting signals.

Identify the role of ions in establishing membrane potential: The movement of ions such as potassium (K+), sodium (Na+), and chloride (Cl-) across the cell membrane contributes to the membrane potential.

Focus on potassium ions: Potassium ions play a significant role in maintaining the negative charge inside the neuron. The cell membrane is more permeable to potassium ions than to sodium ions.

Explain diffusion of potassium: Potassium ions tend to diffuse out of the cell due to their concentration gradient, which is higher inside the cell than outside. This diffusion contributes to the negative charge inside the neuron.

Consider active transport mechanisms: While diffusion is a passive process, active transport mechanisms like the sodium-potassium pump also play a role in maintaining the membrane potential by pumping sodium out and potassium into the cell, but the diffusion of potassium out is key to the negative charge.