15. Be able to draw an action potential in an autorhythmic cell. Include the following• pacemaker potential. what channels are open at each part. which ions influx or efflux at each partthe time for one AP to occur• depolarization• repolarization.Membrane Potential (mv)+20-20-40-600 secAA0.8 sec= 800 msecTime1.6 sec-1600 msec16. State what specific group of cells in the conduction system normally determines theheart rate.Fo

The cardiac action potential is a brief change in voltage called membrane potential across the cell…

Answered: the time for one AP to occur Membrane…

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

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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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rhythm strips
Caffeine lowers the heart rate by increasing rates of depolarization at the SA node True False Nicotine raises the heart rate because it stimulates the activity of the sympathetic neurons in medulla oblongata True False The Frank-Starling Law of the Heart states that the force of heart contraction is directly proportional to the initial length of the muscle fiber, within optimal limits of length True False If the sarcomeres stretched beyond the optimal length, the force of contraction would go down, but that can potentially happen only during open heart surgery when the heart is not constrained by the pericardium, lungs, ribs and diaphragm. True False It is the Na+ channel-driven spontaneous depolarization that is affected by sympathetic and parasympathetic inputs to speed up or slow down the firing rate of the SA node and other conductive cells. True False
rhythm strips
Antiarrhythmic drugs are used to correct an irregular heartbeat. Give 2 examples each of class 1-1V drugs that act at positions 0-4 of the myocardial action potential sequence. Do not give brand names, use generic names.
7. This is not and will not be graded
Repolarization of the ventricles typically _______. A begins at the end of the T-wave and continues through the next P wave B occurs throughout the duration of the S-T segment of the electrocardiogram C begins at the top center of the ventricles like depolarization D begins at the apex of the ventricles and occurs in the opposite direction as depolarization.
3. During phase 1 of the cardiac contractile cell: electrochemical K+ efflux is offset by electrochemical Na+ influx O chemical gradient K+ influx is nearly offset by electrostatic K+ efflux O there is a net electrochemical K+ efflux O chemical gradient K+ efflux is nearly offset by electrostatic K+ influx
V09
Rhythm strips

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the time for one AP to occur Membrane Potential (mv) +20 <-20 -40 -60 0 sec • repolarization JA 0.8 sec = 800 msec Time- 1.6 sec -1600 msec 5. State what specific group of cells in the conduction system normally deter heart rate.