Test 2/5/25 Patho Heart conduction

What does a composite recording of all action potentials in the myocardium represent?

It shows each wave or segment corresponding to certain events in the cardiac electrical cycle.

What does the P wave represent in the cardiac cycle?

The P wave occurs when the atria fill with blood and the SA node fires, causing atrial depolarization.

What does the PQ Segment reflect in the cardiac electrical cycle?

It represents the time the electrical signal travels from the SA node to the AV node.

What major event does the QRS Complex mark?

It marks the firing of the AV node and represents ventricular depolarization.

What occurs during the R wave of the cardiac cycle?

The R wave represents the depolarization of the main mass of the ventricles.

What is signified by the S wave in the cardiac cycle?

The S wave signifies the last phase of ventricular depolarization and the obscuring of atrial repolarization.

What is indicated by the ST segment in cardiac events?

The ST segment reflects the plateau in the myocardial action potential during ventricular contraction.

What does the T wave indicate in the cardiac cycle?

The T wave represents ventricular repolarization.

What is the significance of the term 'contractility' in cardiac muscle cells?

Contractility refers to the ability of muscle cells to shorten and contract.

What does 'elasticity' refer to in the context of the heart?

Elasticity refers to the heart's ability to resume its shape after being stretched.

What condition is characterized by swelling caused by excess fluid in tissues?

Congestive heart failure leads to edema.