7. A drug that blocks the cardiac muscarinic receptor might be expected to:Increased heart rateDecreased heart rateOpen mechanically-gated K channelsDecreased contractilityDecrease pacemaker potential

We know that Cardiac muscarinic antagonists are the agent that inhibits the function of the…

Answered: A drug that blocks the cardiac…

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

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter9: Cardiac Physiology

Section9.2: Electrical Activity Of The Heart

Problem 1CYU

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A drug that blocks the cardiac muscarinic receptor might be expected to: Increased heart rate Decreased heart rate Open mechanically-gated K channels Decreased contractility Decrease pacemaker potential
Autorhythmic cells in the SA node intrinsically fire at a rate of - 90 action potentials per minute. At rest, the heart rate is lowered primarily through modulation by: O Decreased delivery of acetylcholine and increased delivery of norepinephrine Increased delivery of acetylcholine and decreased delivery of norepinephrine Cardiac contractile cells Decreased delivery of acetylcholine and decreased delivery of norepinephrine Increased delivery of acetylcholine and increased delivery of norepinephrine O O O
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
In which of the following situations is calcium moving through a channel in the pacemaker membrane driven by concentration but against charge? O during the repolarization phase of the action potential, just before the channel closes O during the depolarization phase of the action potential, just after the channel opens O never O at all times that sodium is moving through the membrane O during the repolarization phase of the action potential, just after the channel opens O during the depolarization phase of the action potential, just before the channel closes O during the pacemaker potential, just before the funny channel closes
which of the following conditions at the S-A node will cause a decrease in heart rate? increased sodium permeability decreased acetylcholin levelsincreased norepinephrine levels increased potassium permeabilityincreased calcium permeability
Describe the conduction pathway of the heart, and discuss two examples of disease states where conduction is altered Provide examples provide steps
Parasympathetic stimulation decreases the heart rate by Decreasing permeability of SA node cells to Ca2+ increasing ion influx, thus increasing the rate of depolarization. Increasing the permeability of SA node cells to Ca2+. Increasing the permeability of SA (sinoatrial) node cells to K+.
Slow conduction in the atrioventricular node is associated with which of the following? Group of answer choices Prolonged PR interval Prolonged QRS interval Shortened QT interval Elevated ST segment
Autorhythmic cells in the SA node intrinsically fire at a rate of - 90 action potentials per minute. During exercise, the heart ráte is increased primarily through modulation by: Increased sympathetic input and parasympathetic input Decreased sympathetic input and parasympathetic input The AV node O Decreased sympathetic input and increased parasympathetic input Increased sympathetic input and decreased parasympathetic input O O O OO
Which of the following interventions will increase cardiac stroke volume? increased activity of cardiac sympathetic nerves increased circulating catecholamine levels increased preload decreased arterial pressure
Saved The therapeutic action of beta-blockers in chronic heart failure is to: Multiple Choice increase the heart rate. increase the actions of norepinephrine and epinephrine. block beta-1 receptors on the heart. increase the force of contraction.
on an EKG strip, a nurse determines that a patient's heart is beating 5 times every 4 seconds. Calculate the time for each heart beat in seconds: Calculate the patient's heart rate in beats/min: (Hint: Divide 60 by the time per beat)

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A drug that blocks the cardiac muscarinic receptor might be expected to: Increased heart rate Decreased heart rate Open mechanically-gated K channels Decreased contractility Decrease pacemaker potential