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

11. Nervous Tissue and Nervous System

Action Potentials

Anatomy & Physiology

11. Nervous Tissue and Nervous System

Action Potentials

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2:51 minutes

Problem 3

Textbook Question

In the CNS, a neuron typically receives information from other neurons at its:
(a) Axon
(b) Nissl bodies
(c) Dendrites
(d) Nucleus

Verified step by step guidance

Step 1: Understand the structure of a neuron. A neuron has three main parts: the cell body (soma), dendrites, and axon. Each part has a specific function in transmitting and receiving information.

Step 2: Recall the function of dendrites. Dendrites are branch-like extensions of the neuron that receive signals (information) from other neurons and transmit them toward the cell body.

Step 3: Review the role of the axon. The axon is responsible for transmitting signals away from the cell body to other neurons, muscles, or glands. It does not typically receive information.

Step 4: Clarify the function of Nissl bodies. Nissl bodies are structures within the cell body that are involved in protein synthesis. They do not play a direct role in receiving information from other neurons.

Step 5: Examine the role of the nucleus. The nucleus is the control center of the cell, containing genetic material, but it does not directly receive information from other neurons. Based on this analysis, the correct answer is related to dendrites.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Neurons

Neurons are the fundamental units of the central nervous system (CNS) responsible for transmitting information throughout the body. They consist of three main parts: the cell body, dendrites, and axon. Dendrites receive signals from other neurons, while the axon transmits impulses away from the cell body to other neurons or muscles.

Dendrites

Dendrites are tree-like structures that extend from the neuron’s cell body and are crucial for receiving synaptic inputs from other neurons. They increase the surface area available for connections, allowing neurons to integrate a vast amount of information. The signals received by dendrites are then processed and can influence the neuron's output.

Synaptic Transmission

Synaptic transmission is the process by which neurons communicate with each other through synapses. When an electrical impulse reaches the end of an axon, it triggers the release of neurotransmitters, which cross the synaptic gap and bind to receptors on the dendrites of the receiving neuron. This process is essential for the propagation of signals within the CNS.

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Related Practice

Textbook Question

Albert, the patient in question 3, takes the drug lithium, which reduces the permeability of the neuronal axolemma to Na⁺ (that is, it allows fewer Na⁺ to enter the axon). Predict the effect this would normally have on his neuronal action potentials. Do you think this drug would be beneficial or harmful, considering his condition?

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Textbook Question

Predict the effect that tetrodotoxin would have on Albert's muscle fiber action potentials (see question 3). Would it affect end-plate potentials at the motor end plate? Why or why not?

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Textbook Question

Explain what would happen if depolarization of the trigger zone led to a negative feedback loop instead of a positive one.

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Textbook Question

Harry has a kidney condition that causes changes in his body's electrolyte levels (concentration of ions in the extracellular fluid). As a result, he is exhibiting tachycardia, an abnormally fast heart rate. Which ion is involved, and how does a change in its concentration cause Harry's symptoms?

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Multiple Choice

Casey is taking a new medication that blocks potassium channels. What stage of an action potential would be MOST affected by this drug?

When an action potential is at its peak, the electrical gradient forces potassium ____________.

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