Channels for sodium ions in the cell membrane open and sodium flows into the cell Both channels for sodium and potassium are closed Channels for potassium ions in the cell membrane open and potassium leaves he cell Sodium potassium pump returms sodium to the outside of the cell and potassium to the inside Stroke occurs when a blood clot enters the cerebral ciruculatin, blocking an artery and causing the death of brain tissue O the pacemaker become defective, producing an irregular heartbeat a blood clot enters and blocks one of the coronary arteries a blood clot dislodges from a vein and moves into the lung, where it blocks a pulmonary artery O the walls of an artery accumulate deposits and loss their flexibility and elasticity Erythrocyte production O is stimulated by erythropoietin. O requires folate, B12, and iron. is stimulated by low 02 levels in the blood. O occurs in red bone marrow. O all of these

Channels for sodium ions in the cell membrane open and sodium flows into the cell Both channels for sodium and potassium are closed Channels for potassium ions in the cell membrane open and potassium leaves he cell Sodium potassium pump returms sodium to the outside of the cell and potassium to the inside Stroke occurs when a blood clot enters the cerebral ciruculatin, blocking an artery and causing the death of brain tissue O the pacemaker become defective, producing an irregular heartbeat a blood clot enters and blocks one of the coronary arteries a blood clot dislodges from a vein and moves into the lung, where it blocks a pulmonary artery O the walls of an artery accumulate deposits and loss their flexibility and elasticity Erythrocyte production O is stimulated by erythropoietin. O requires folate, B12, and iron. is stimulated by low 02 levels in the blood. O occurs in red bone marrow. O all of these

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 3TAHL

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Similar questions

Action potentials occur when ______. a. potassium gates close b. a stimulus pushes membrane potential to threshold c. sodium-potassium pumps become active d. neurotransmitter is reabsorbed
Figure 35.11 Potassium channel blockers, such as amiodarone and procainamide, which are used to treat abnormal electrical activity in the heart, called cardiac dysrhythmia, impede the movement of K+ through voltage-gated K+ channels. Which part of the action potential would you expect potassium channels to affect?
For a neuron to fire an action potential, its membranemust reach ________.a. hyperpolarizationb. the threshold of excitationc. the refractory periodd. inhibitory postsynaptic potential
During an action potential _______ A. Na+ flows out of cell and causes depolarization B. K+ flows into cell and causes repolarization C. Na+ flows into cell and causes depolarization D. K+ flows into cell and causes hyperpolarization
Which of these ions is actively transported through the cell membrane to re-establish a resting potential? K and Mg Na and K Mg and Cl Ca and Cl
Explain how the changes in Na+ and K+ ion concentrationsthat occur during an action potential are associated withdepolarization and repolarization.
All of the following are directly involved in synaptic transmission excepta. voltage-sensitive ion channels on the postsynaptic membraneb. chemical-sensitive ion channels on the postsynaptic membranec. Ca2+d. neurotransmitters
Excitatory neurons A and B both synapse with neuron C. Neuron A releasesa neurotransmitter, and neuron B releases the same type and amount ofneurotransmitter plus a neuromodulator that produces EPSPs in neuron C.Action potentials produced in neuron A alone can result in action potentialproduction in neuron C. Action potentials produced in neuron B alone alsocan cause action potential production in neuron C. Which results in moreaction potentials in neuron C, stimulation by only neuron A or stimulationby only neuron B? Explain.
During the resting state, a neuron is: polarized with sodium ions outside the cell and potassium ions inside the cell restoring the ionic conditions utilizing the sodium-potassium pump depolarizing and generating an action potential propagating the action potential repolarizing as potassium ions diffuse out of the cell
The changes in membrane potential when a neuron is transmitting information is called ..... threshold action potential chemical potential resting potential
A change in the voltage across a neuron’s plasma membranethat makes the neuron less likely to fire an action potential isa. a change that makes the resting potential less negative.b. an excitatory postsynaptic potential.c. an inhibitory postsynaptic potential.d. a change that lowers the threshold.
During a relative refractory period of an action potential A. Another action potential can be fired, it just takes a greater stimulus for the membrane potential to reach threshold B. Na+ channels are either already open or are inactivated therefore the membrane absolutely can not produce another action potential, no matter how intense the stimulus C. Ca++ flows out of the cell, causing hyperpolarization and a need for a greater stimulus to generate the action potential D. The presynaptic neuron "tells" the postsynaptic neuron about the "relative" strength of signal E. None of the above are correct