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The Vm labeled A could be produced by _. +40 +20 Membrane potential difference (Vm) at rest -20 Vm -40 Vm 09 B -80 A -100 -120 Time (msec) Membrane potential (mV)

The Vm labeled A could be produced by _. +40 +20 Membrane potential difference (Vm) at rest -20 Vm -40 Vm 09 B -80 A -100 -120 Time (msec) Membrane potential (mV)

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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### Ion Channel Mechanism Quiz Select the correct ion channel mechanism: - ⃝ opening of Na<sup>+</sup> channels - ⃝ closure of Ca<sup>2+</sup> channels - ⃝ closure of Cl<sup>-</sup> channels - ⃝ opening of K<sup>+</sup> channels Each option represents a different type of ion channel activity important for understanding various physiological processes in cellular biology. Select the appropriate mechanism that corresponds to the question posed in your study material.
Transcribed Image Text:### Ion Channel Mechanism Quiz Select the correct ion channel mechanism: - ⃝ opening of Na<sup>+</sup> channels - ⃝ closure of Ca<sup>2+</sup> channels - ⃝ closure of Cl<sup>-</sup> channels - ⃝ opening of K<sup>+</sup> channels Each option represents a different type of ion channel activity important for understanding various physiological processes in cellular biology. Select the appropriate mechanism that corresponds to the question posed in your study material.
### QUESTION 10 The Vm labeled A could be produced by ___. #### Explanation of the Diagram: The graph depicts the relationship between membrane potential (Vm) and time (msec) in a neuron. The horizontal axis represents time in milliseconds (msec), and the vertical axis represents membrane potential in millivolts (mV). Several key points are indicated on the graph: - **Membrane potential at rest:** The dashed horizontal line labeled "Membrane potential difference (Vm) at rest" represents the resting membrane potential of the neuron. This is the voltage difference across the neuronal membrane when the neuron is not actively sending a signal. - **Vm (Membrane Potential):** This notation is used to denote various membrane potentials and fluctuations from the resting state. - **Point A:** This point shows a significant negative deflection from the resting membrane potential. - **Point B:** This point shows a significant positive deflection from the resting membrane potential. #### Key Characteristics: 1. **Resting Membrane Potential:** The stable voltage (-60 mV) around which the membrane potential oscillates in a resting neuron. 2. **Vm labeled A:** A hyperpolarization event, where the membrane potential becomes more negative than the resting potential, indicating an inhibitory signal or potential. 3. **Vm labeled B:** A depolarization event, where the membrane potential becomes more positive than the resting potential, indicating an excitatory signal or action potential. Understanding these points and the underlying principles is crucial for interpreting neuronal behavior and the electrical signaling in the nervous system.
Transcribed Image Text:### QUESTION 10 The Vm labeled A could be produced by ___. #### Explanation of the Diagram: The graph depicts the relationship between membrane potential (Vm) and time (msec) in a neuron. The horizontal axis represents time in milliseconds (msec), and the vertical axis represents membrane potential in millivolts (mV). Several key points are indicated on the graph: - **Membrane potential at rest:** The dashed horizontal line labeled "Membrane potential difference (Vm) at rest" represents the resting membrane potential of the neuron. This is the voltage difference across the neuronal membrane when the neuron is not actively sending a signal. - **Vm (Membrane Potential):** This notation is used to denote various membrane potentials and fluctuations from the resting state. - **Point A:** This point shows a significant negative deflection from the resting membrane potential. - **Point B:** This point shows a significant positive deflection from the resting membrane potential. #### Key Characteristics: 1. **Resting Membrane Potential:** The stable voltage (-60 mV) around which the membrane potential oscillates in a resting neuron. 2. **Vm labeled A:** A hyperpolarization event, where the membrane potential becomes more negative than the resting potential, indicating an inhibitory signal or potential. 3. **Vm labeled B:** A depolarization event, where the membrane potential becomes more positive than the resting potential, indicating an excitatory signal or action potential. Understanding these points and the underlying principles is crucial for interpreting neuronal behavior and the electrical signaling in the nervous system.
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