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

Action Potentials

Anatomy & Physiology

11. Nervous Tissue and Nervous System

Action Potentials

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Multiple Choice

What happens when the neuron reaches threshold (-55 mV)?

Voltage-gated potassium channels open and potassium rushes into cell.

Voltage-gated sodium channels open and sodium rushes into the cell.

Voltage-gated potassium channels open and sodium channels close.

The sodium potassium pump immediately establishes resting potential.

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Verified step by step guidance

Understand the concept of action potential: Neurons communicate through electrical signals called action potentials. An action potential is initiated when the neuron reaches a specific membrane potential known as the threshold, typically around -55 mV.

Identify the role of voltage-gated sodium channels: At the threshold potential, voltage-gated sodium channels open. This allows sodium ions (Na+) to rush into the neuron due to the concentration gradient and electrical gradient.

Recognize the effect of sodium influx: The influx of sodium ions causes the membrane potential to become more positive, leading to the depolarization phase of the action potential.

Differentiate between sodium and potassium channels: While sodium channels open at the threshold, voltage-gated potassium channels open later, during the repolarization phase, allowing potassium ions (K+) to exit the cell.

Clarify the role of the sodium-potassium pump: After the action potential, the sodium-potassium pump helps restore the resting potential by moving sodium ions out of the cell and potassium ions back into the cell, but it does not act immediately at the threshold.