cardiac physiology Q4.

1- direction 2- depolarisation/repolarization 3- size of the change in potential.

1- SA node initiate impulse. 2- atrial muscle depolarisation. (P) 3- atrial contraction. 4- depolarisation of AV node and its bundle. 5- repolraization of atria. 6- depolrization of ventricular muscle. (QRS) 7- contraction of ventricular muscle. 8- repolrization of ventricular muscle. (T).

the electrical vector (magnitude and direction) of the cardiac cycle.

<p>depolriazation of ventricular muscle. Q- initial downward deflection. R- initial upward deflection. S- downward deflection (isoelectric point).</p> Signup and view all the answers

<p>from the beginning of the P wave to the beginning of the R portion of QRS complex,</p> <p>used to determine if impulse conduction from atria to ventricle is normal, prolonged PR interval may suggest AV block ( as impuls passes through AV node into the ventricle during PR interv).</p> Signup and view all the answers

<p>is the flat line between the end of P wave and the QR complex in PR. it reflects slow impulse conduction through Av node, and used as a baseline/reference/isoelectric line.</p> Signup and view all the answers

<p>end diastolic volume-the volume of blood in the ventricles at the and of diastole (130ml)</p> Signup and view all the answers

<p>end systolic volume- the volume of blood in ventricles at the and of systole, (60ml).</p> Signup and view all the answers

<p>stroke volume-the amount of blood ejected from ventricles in one beat = EDV-ESV.</p> Signup and view all the answers

<p>cardiac output= SV (ml/beat) * hear rate (beats/min).</p> Signup and view all the answers