Cardiac Physiology Quiz

<p>90-110 beats per minute</p> Signup and view all the answers

<p>Baroreceptors</p> Signup and view all the answers

<p>Increases heart rate</p> Signup and view all the answers

<p>Decreases heart rate</p> Signup and view all the answers

<p>By increasing stroke volume as venous return increases</p> Signup and view all the answers

<p>Positive inotropic agents increase contractility, while negative inotropic agents decrease contractility.</p> Signup and view all the answers

<p>Tachycardia</p> Signup and view all the answers

<p>Preload and contractility both increase stroke volume</p> Signup and view all the answers

<p>Inhibiting SA node firing rate</p> Signup and view all the answers

<p>They have unusually low resting heart rates</p> Signup and view all the answers

<p>By increasing the firing rate of the SA node</p> Signup and view all the answers

<p>The rate and rhythm of the heartbeat</p> Signup and view all the answers

<p>It increases contractility by stimulating calcium entry into myocardial cells</p> Signup and view all the answers

<p>Stroke volume</p> Signup and view all the answers

<p>Glucagon</p> Signup and view all the answers

<p>They reduce cardiac output by increasing afterload</p> Signup and view all the answers

<p>Vagal tone decreases the resting heart rate by inhibiting the parasympathetic nervous system</p> Signup and view all the answers

<p>High potassium levels decrease heart rate by inhibiting the parasympathetic nervous system</p> Signup and view all the answers

<p>They increase heart rate by inhibiting the parasympathetic nervous system</p> Signup and view all the answers

<p>Well-conditioned athletes have lower resting heart rates due to increased parasympathetic nervous system activity</p> Signup and view all the answers

<p>Calcium increases contractility by increasing the firing rate of the SA node</p> Signup and view all the answers

<p>Certain diseases increase afterload, leading to a reduction in cardiac output</p> Signup and view all the answers

<p>Baroreceptors decrease heart rate by detecting high blood pressure and stimulating the parasympathetic nervous system</p> Signup and view all the answers

<p>Exercise increases cardiac output by primarily increasing stroke volume</p> Signup and view all the answers

<p>Increases the firing rate of the SA node</p> Signup and view all the answers

<p>By increasing the release of acetylcholine</p> Signup and view all the answers

<p>Decrease myocardial contractility</p> Signup and view all the answers

<p>By decreasing myocardial contractility</p> Signup and view all the answers

<p>Increases myocardial contractility</p> Signup and view all the answers

<p>Increases heart rate</p> Signup and view all the answers

<p>By increasing sympathetic activity</p> Signup and view all the answers

<p>Bradycardia</p> Signup and view all the answers

<p>100-120 beats per minute</p> Signup and view all the answers

<p>Increases contractility by promoting the release of calcium from the sarcoplasmic reticulum</p> Signup and view all the answers

<p>60-100 beats per minute</p> Signup and view all the answers

<p>Increases heart rate</p> Signup and view all the answers

<p>Increases heart rate</p> Signup and view all the answers

<p>By increasing stroke volume with increased venous return</p> Signup and view all the answers

<p>$100 beats per minute$</p> Signup and view all the answers

<p>By changing the firing rate of the SA node</p> Signup and view all the answers

<p>Increase cardiac output by increasing afterload</p> Signup and view all the answers

<p>By increasing cardiac output through increased heart rate and stroke volume</p> Signup and view all the answers

<p>$Decreasing potassium levels increases heart rate$</p> Signup and view all the answers

<p>Increase contractility</p> Signup and view all the answers

<p>Decreasing resting heart rates due to increased vagal tone</p> Signup and view all the answers

<p>It increases heart rate by stimulating the SA node</p> Signup and view all the answers

<p>60-100 bpm and decreases with age</p> Signup and view all the answers

<p>Their effect on heart rate varies depending on the hormone and its mechanism of action</p> Signup and view all the answers

<p>By increasing contractility</p> Signup and view all the answers

<p>They decrease contractility and stroke volume</p> Signup and view all the answers

<p>By increasing the resistance to blood flow in the blood vessels</p> Signup and view all the answers

<p>$100-150$ bpm and vagal tone decreases firing rate to $60-100$ bpm</p> Signup and view all the answers

<p>They have distinct effects on stroke volume by influencing ventricular filling and ejection</p> Signup and view all the answers

<p>They all increase contractility by stimulating myocardial cells</p> Signup and view all the answers