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A graded potential that achieves threshold leads to the generation of an action potential. Which one of the following statement/s regarding graded and action potentials is/are true? O graded potentials result from the opening of chemically gated sodium channels O action potentials result from the opening of voltage gated sodium channels O graded potentials result from the opening of calcium gated channels and action potentials result from the opening of sodium gated channels a and b Next

A graded potential that achieves threshold leads to the generation of an action potential. Which one of the following statement/s regarding graded and action potentials is/are true? O graded potentials result from the opening of chemically gated sodium channels O action potentials result from the opening of voltage gated sodium channels O graded potentials result from the opening of calcium gated channels and action potentials result from the opening of sodium gated channels a and b Next

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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### Understanding Graded Potentials and Action Potentials In the context of neural physiology, understanding the mechanisms of graded potentials and action potentials is fundamental. A graded potential that achieves the threshold leads to the generation of an action potential. To test your knowledge, consider which of the following statements regarding graded and action potentials is/are true: 1. **Graded potentials result from the opening of chemically gated sodium channels.** 2. **Action potentials result from the opening of voltage-gated sodium channels.** 3. **Graded potentials result from the opening of calcium-gated channels and action potentials result from the opening of sodium-gated channels.** 4. **a and b** Please select the correct answer from the options provided. ### Explanation: 1. **Graded Potentials**: These are changes in membrane potential that vary in size, as opposed to being all-or-nothing. They are often the result of the opening of chemically gated ion channels. 2. **Action Potentials**: These are rapid and uniform changes in membrane potential that propagate along the length of an axon. They are generally initiated by the opening of voltage-gated sodium channels when the membrane potential reaches a certain threshold. 3. **Calcium-Gated Channels**: While calcium ions play a key role in various cellular processes, their influence on graded potentials is less direct compared to sodium ions through chemically gated channels. ### Correct Answer: Option 4: **a and b**
Transcribed Image Text:### Understanding Graded Potentials and Action Potentials In the context of neural physiology, understanding the mechanisms of graded potentials and action potentials is fundamental. A graded potential that achieves the threshold leads to the generation of an action potential. To test your knowledge, consider which of the following statements regarding graded and action potentials is/are true: 1. **Graded potentials result from the opening of chemically gated sodium channels.** 2. **Action potentials result from the opening of voltage-gated sodium channels.** 3. **Graded potentials result from the opening of calcium-gated channels and action potentials result from the opening of sodium-gated channels.** 4. **a and b** Please select the correct answer from the options provided. ### Explanation: 1. **Graded Potentials**: These are changes in membrane potential that vary in size, as opposed to being all-or-nothing. They are often the result of the opening of chemically gated ion channels. 2. **Action Potentials**: These are rapid and uniform changes in membrane potential that propagate along the length of an axon. They are generally initiated by the opening of voltage-gated sodium channels when the membrane potential reaches a certain threshold. 3. **Calcium-Gated Channels**: While calcium ions play a key role in various cellular processes, their influence on graded potentials is less direct compared to sodium ions through chemically gated channels. ### Correct Answer: Option 4: **a and b**
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