Cardiovascular Physiology: The Cardiac Cycle, Heart Sounds, and ECG

Flashcards covering key concepts and definitions from the lecture on cardiovascular physiology, including the cardiac cycle, heart sounds, and ECG interpretation.

Atrial Systole

The phase of the cardiac cycle where the atria contract and push blood into the ventricles.

Ventricular Diastole

The phase of the cardiac cycle when all chambers are relaxed and the ventricles fill passively.

Auscultation

The act of listening to sounds within the body, typically using a stethoscope.

First Heart Sound (S1)

The sound 'lubb' created by blood turbulence associated with the closing of the atrioventricular valves.

Second Heart Sound (S2)

The sound 'dupp' representing the closing of the semilunar valves at the end of ventricular systole.

SA Node

The sinoatrial node, the heart's natural pacemaker that initiates the electrical impulses for heartbeats.

P wave

Represents depolarization of the SA node and atria in an ECG.

QRS Complex

Indicates ventricular depolarization and atrial repolarization in an ECG.

T Wave

Represents ventricular repolarization in an ECG.

Heart Rate Calculation Method 1

Count the large time boxes between two successive R waves and divide 300 by this number.

Heart Rate Calculation Method 2

Divide 60 seconds by the beat period to find the heart rate.