7. Assuming equivalent stimulation of the two pre-synaptic axons in the diagram below, in which of thetwo post-synaptic cells will you observe a stronger response? Why?= 5-HT= 5-HT receptor= 5-HTT (transporter)

Neurons communicate by using chemical messengers like serotonin between cells. Serotonin transporter…

Answered: 7. Assuming equivalent stimulation of…

Cardiopulmonary Anatomy & Physiology

7th Edition

ISBN:9781337794909

Author:Des Jardins, Terry.

Publisher:Des Jardins, Terry.

Chapter12: Electrophysiology Of The Heart

Section: Chapter Questions

Problem 3RQ

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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.
Which of the following statements best describes saltatory conduction? a. It inhibits direct neurotransmitter release. b. It transmits the action potential at the nodes of Ranvier andthus speeds up impulses on myelinated axons. c. It increases neurotransmitter release at the presynapticmembrane. d. It decreases neurotransmitter uptake at chemically gatedpostsynaptic channels. e. It removes neurotransmitters from the synaptic cleft.
An example of a synapse could be the site where: a. neurotransmitters released by an axon travel across a gap and are picked up by receptors on a muscle cell. b. an electrical impulse arrives at the end of a dendrite causingions to flow onto axons of presynaptic neurons. c. postsynaptic neurons transmit a signal across a cleft to apresynaptic neuron. d. oligodendrocytes contact the dendrites of an afferent neurondirectly. e. an onoff switch stimulates an electrical impulse in apresynaptic cell to stimulate other presynaptic cells.
Which of the following is probably going to propagate an action potential fastest? a thin, unmyelinated axon a thin, myelinated axon a thick, unmyelinated axon a thick, myelinated axon
For a neuron to fire an action potential, its membrane must reach. hyperpolarization the threshold of excitation the refractory period inhibitory postsynaptic potential
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
An action potential begins when ___ . a. a neuron reaches threshold potential b. voltage-gated potassium gates open c. voltage-gated .sodium gates dose d. sodium-potassium pumps stop operating
After an action potential, the opening of additional____voltage-gated ____ channels and The inactivation of sodium channels, cause the membrane to return to its resting membrane potential. sodium potassium calcium chloride
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.
Which of these physiological changes would not be considered part of the sympathetic fight-or-flight response? increased heart rate increased sweating dilated pupils increased stomach motility
Watch this video (http://openstaxcollege.org/l/summation) to learn about summation. The process of converting electrical signals to chemical signals and back requires subtle changes that can result in transient increases or decreases in membrane voltage. To cause a lasting change in the target cell, multiple signals are usually added together, or summated. Does spatial summation have to happen all at once, or can the separate signals arrive on the postsynaptic neuron at slightly different times? Explain your answer.
4. Which term describes the cell membrane potential of a neuron at rest? a. polarized b. depolarized c. hyperpolarized d. repolarized e. sympolarized

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7. Assuming equivalent stimulation of the two pre-synaptic axons in the diagram below, in which of the two post-synaptic cells will you observe a stronger response? Why? = 5-HT = 5-HT receptor = 5-HTT (transporter)