Answered: Describe the 6 step sequence of events…

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Biology

Describe the 6 step sequence of events that occurs at the NMJ in response to a nerve Action Potential.

Cardiopulmonary Anatomy & Physiology

7th Edition

ISBN:9781337794909

Author:Des Jardins, Terry.

Publisher:Des Jardins, Terry.

Chapter12: Electrophysiology Of The Heart

Section: Chapter Questions

Problem 10RQ

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Describe the 6 step sequence of events that occurs at the NMJ in
response to a nerve Action Potential.

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Which of the following does not contribute to propagation of action potentials? a. As the area outside the membrane becomes negative, itattracts ions from adjacent regions; as the inside of the membrane becomes positive, it attracts negative ions from nearby in the cytoplasm. These events depolarize nearby regions of the axon membrane. b. The refractory period allows the impulse to travel in only one direction. c. Each segment of the axon prevents the adjacent segments from firing. d. The magnitude of the action potential stays the same as it travels down the axon. e. Up to a limit, increasing the intensity of the stimulus increases the number of action potentials.
In the propagation of a nerve impulse: a. the refractory period begins as the K+ channel opens, allowing K+ ions to flow outward along their concentrationgradient. b. Na+ ions flow out of the axon with their concentration gradient. c. positive charges lower the membrane potential to its lowestaction potential. d. gated K+ channels open at the same time as the activationgate of Na+ channels closes. e. the depolarizing stimulus lowers the membrane potential toopen the Na+ gates.
The major role of the Na+/K+ pump is to: a. cause a rapid firing of the action potential so the inside of themembrane becomes momentarily positive. b. decrease the resting membrane potential to zero. c. hyperpolarize the membrane above resting value. d. cause an action potential to enter a refractory period. e. maintain the resting membrane potential at a constantnegative value.
1. Which of the following is the rapid upstroke in the action potential? A. Phase 0 B. Phase 1 C. Phase 2 D. Phase 3
Which of the following voltages would most likely be measured during the relative refractory period? +30 mV 0 mV -45 mV -80 mv
Describe the 6 step sequence of events that occurs at the NMJ in response to a nerve Action Potential.
1: Describe the changes in the neuron membrane that occur throughout the course of an action potential. 2: Mention: Resting state, threshold, depolarization, repolarization, and hyperpolarization. 3: mention how the action potential is related to neuron communication.
1. An action potential does occur in response to a _____ , which strong enough to depolarize the membrane to threshold.
1. It is not important to know the actual numbers for absolute or relative refractory periods. Due to refractory periods, is there a maximum frequency of APs?
1.Why are Neurotransmitters critical to our ability to experience stress, relaxation, pain and pleasure? Justify the answer with reference to the functions of Neurotransmitters.
5. The falling phase of the action potential due to the: A. Entry of sodium ions B. Exiting of sodium ions C. Entry of potassium ions D. Exiting of potassium ions
1. If you block calcium channels on an axon, which will not occur? A) exocytosis of neurotransmitter B) repolarization phase of the action potential C) depolarization phase of the action potential D) hyperpolarization phase of the action potential E) graded potential