Cardiac Cycle and Control Quiz

To produce a squeezing action and ensure the heart can contract effectively.

Sarcomeres are the contractile units that enable muscle contraction.

They facilitate synchronized contraction between muscle cells.

<p>To circulate blood around the body through a sequence of heart contractions and relaxations.</p> Signup and view all the answers

<p>By regulating the sequence of contraction and relaxation of heart chambers.</p> Signup and view all the answers

<p>Valves open and close due to pressure changes to direct blood flow through the heart.</p> Signup and view all the answers

<p>The SAN is a natural pacemaker that initiates the cardiac cycle by sending out regular waves of depolarization to the atrial walls.</p> Signup and view all the answers

<p>The AV Node delays the electrical impulse by about 0.1 seconds to allow time for the ventricles to fully contract.</p> Signup and view all the answers

<p>The Bundle of His conducts the electrical wave to the bottom of the heart's septum.</p> Signup and view all the answers

<p>The Purkinje fibers spread the electrical wave through the ventricle walls, causing efficient contraction from the bottom up.</p> Signup and view all the answers

<p>The cardiac muscle is myogenic because it can initiate its own contraction and relaxation without signals from nerve cells.</p> Signup and view all the answers

<p>The atria fill with blood, increasing their pressure. The ventricle pressure falls below the atria pressure, forcing open the AV valve.</p> Signup and view all the answers

<p>Atrial Systole/Contractions</p> Signup and view all the answers

<p>Heart rate drops below 60 beats per minute</p> Signup and view all the answers

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

<p>Extra heart beat different from the normal pattern</p> Signup and view all the answers

<p>Irregular waves of electrical excitation over atria</p> Signup and view all the answers

<p>Transport oxygen</p> Signup and view all the answers