Which of the following is not true about the resting Cardiac membrane potential?O A. The membrane resting potential is equal to the Nernst potential for potassium.O B. The membrane resting potential has a low sodium conductance.O C. Balanced current flow gives rise to the resting membrane potential.O D. Pumps and exchangers maintain the background electrical gradients.O E. The Nernst potential for sodium is positive to the resting membrane potential.

Action potentials are the means of signal transmission generated and conducted by neurons in an…

Answered: Which of the following is not true…

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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Which of the following are false about the inward rectifier? OA The inward rectifier current is carried by potassium OB. The inward rectifier carries inward current at potentials negative to the Nersnst potential for potassium under voltage clamp conditions. OC. The inward rectifier current obeys Ohm's law. OD. The inward rectifier is absent in the sino-atrial node. OE All of the above are true.
Which of the following would increase mean arterial pressure (MAP) ? Group of answer choices An increase in sympathetic activity An increase in arteriolar diameter A reduction in heart rate A reduction in cardiac output
The function of the right and left bundle branches is to _____. A rapidly transmit action potentials along the interventricular septum B contract forcefully to eject blood from the ventricle C spontaneously depolarize to start a second action potential in the ventricles D delay action potentials so that the atria have time to contact before the ventricles
the herbal supplements bitter orange, also known as synephrine, mimics the effects of neurotransmitters on the SNS on the heart and blood vessels serving the abdominal viscera and skin. what effect do you think this would have on the blood pressure? Considering this, do you think this drug should be given to people with hypertension (high blood pressure)?
The role of calcium currents in cardiac contractile cells is to . The role of calcium currents in cardiac conductive cells is to . Choose between: release neurotransmitter, bring the membrane potential to threshold, initiate action potential, prolong action potential, terminate action potential
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Sympathetic stimulation increases the phosphorylation of the Ca2+ATPase in the sarcoplasmic reticulum. What effect does this have on cardiac function? It increases the rate of diastole It decreases the stretch of the ventricles The rate of systole decreases
KEY Stimulus Medullary cardiovascular control center Sensory receptor Integrating center Efferent path Effector Change in blood pressure Parasympathetic Carotid and aortic baroreceptors neurons Sympathetic neurons SA node Ventricles Veins Arterioles Copyright 2009 Pearson Education, Inc. 1. In the diagram above, describe the role of the integrating center and two of the effectors. 2. What will atherosclerosis do to the peripheral resistance? 3. What will atherosclerosis do to the heart rate
A 28-year-old athlete is noted to have a baseline heart rate of 55bpm, which his trainer attributes to excellent parasympathetic (vagal) tone. This parasympathetic effect normally increases Ach release at the SA and AV nodes. Ach release into AV node leads to which of the following effects of its fibers? a. increased action potential amplitudeb. increased conduction velocityc. increased K+ equilibrium potentiald. Hyperpolarizatione. increased rate of depolarization of the pacemaker potential
Which portion of the ECG corresponds torepolarization of the atria?a. P waveb. QRS complexc. T waved. none of the above: atrial repolarization is maskedby ventricular depolarization
Which action potential phase is paired CORRECTLY with when it happens during the EKG? A. Action potential B, phase 0 = T wave B. Action potential A, phase 0 = QRS complex C. Action potential A, phase 3 = S-wave D. Action potential B, phase 0 = PQ interval E. Action potential A, phase 4 = ST segment
During atrial fibrillation: A. The EKG shows an exaggerated P wave. B. There is a noticeable increase in the regularity of beating. OC. The ventricle undergoes reentrant refractoriness. OD. None of the above. OE. All of the above.

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