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

4. Tissues & Histology

Nervous Tissue: The Neuron

Anatomy & Physiology

4. Tissues & Histology

Nervous Tissue: The Neuron

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Multiple Choice

Why is the outside of a neuron positively charged during the resting state?

Because sodium ions are more concentrated outside the neuron.

Because chloride ions are more concentrated inside the neuron.

Because potassium ions are more concentrated outside the neuron.

Because calcium ions are more concentrated inside the neuron.

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Verified step by step guidance

Understand the concept of the resting membrane potential: Neurons have a resting membrane potential, which is the electrical potential difference across the cell membrane when the neuron is not actively sending a signal.

Identify the key ions involved: The main ions that contribute to the resting membrane potential are sodium (Na+), potassium (K+), chloride (Cl-), and calcium (Ca2+).

Examine the distribution of ions: During the resting state, sodium ions (Na+) are more concentrated outside the neuron, while potassium ions (K+) are more concentrated inside the neuron.

Consider the role of ion channels and pumps: The sodium-potassium pump actively transports Na+ out of the neuron and K+ into the neuron, maintaining the concentration gradients. This pump moves 3 Na+ ions out for every 2 K+ ions in, contributing to the positive charge outside.

Conclude why the outside is positively charged: The higher concentration of Na+ ions outside the neuron compared to the inside, along with the action of the sodium-potassium pump, results in a net positive charge outside the neuron during the resting state.