Question

Putting it all together: Use ECG Flat line 5 all together: Use the ECG graph and list of suggestions to fill out the table that links conduction and the cardiac cycle phases with one another. Heart Semilunar Conduction Atria Ventricles Blood Going Cardiac Cycle AV Valves Valves Sounds TO... Late ventricular TNO diastole Atrial systole 2200 node PQ interval Atrial systole Pwave QRS complex Atrial diastole learly ventricular systole Late ventricular systole ST interval Twave Early ventricular diastole Indicate the following for each of the remaining categories in the table: • Conduction: List the structures that the impulse is passing through. Options in no particular order): AV node to Bundle of His; SA node to AV node; Bundle of His to Purkinje fibers; No impulse • Atria: Systole or Diastole • Ventricles: Systole or Diastole • Where is blood going to? (in no particular order): Pulmonary and Systemic Circuits; Ventricles: Atria; Atria & Ventricles; No blood is moving, • AV valves: Closed or open • Semilunar valves: Closed or open • Heart Sounds: lubb, dupp, or silence 106919|162 W120)

Answer 1

ECG or Electro cardiogram is the recording of electrical signals of heart during each heart beat. The action potential starts from SA node and conducted to AV node in 0.3 seconds which appears as P wave in the ECG. The atrial systole begins at P wave and delayed for 0.1 seconds to help complete filling of ventricle before appearance of Q wave which is the P-Q interval. The Action potential enter into AV bundle and propagate through Purkinje fibers and the ventricular systole begins with appearance of QRS complex in the ECG. The blood is pumped through the semilunar valves and the Ventricles start to relax which appears as T wave in the ECG at 0.4 second of cardiac cycle.. The ventricular repolarization Complete by around 0.6 seconds and both atria and ventricles relax for the next 0.2 seconds. after completion of total 0.8 seconds, next cycle begins.

The heart sounds Lub (S1) heard just before the ventricular systole due to the closure of AV valves and Dub(S2) heard at the end of ventricular systole dur to the closure of semilunar valves.

ECG	Conduction	Atria	Ventricle
Flat line	No impulse
P wave	SA node to AV node	Systole	Diastole
PQ interval	AV node to bundle of his	Systole	Diastole
QRS Complex	Bundle of his ti Purkinje fibers	Diastole	Systole
ST interval	Purkinje fibers(apex) to remaining Ventricular myocardium(base).	Diastole	Systole
T wave	Apex of heart to Ventricular myocardium	Diastole	Diastole

Cardiac cycle	Blood going to	AV valves	Semilunar valves	Heart sound
Late ventricular diastole	ventricles( passive)	closed	open	silence
Atrial systole	Atria to ventricle	open	closed	silence
Atrial diastole/ early ventricular systole	No blood is moving	closed	closed	Lub at begining of ventricular systole
Late ventricular systole	Pulmonary and systemic circuits	closed	open	dub at the end of ventricular systole.
early ventricular diastole	Atria	closed	closed	silence