Heart - patho

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

It corresponds to different events of the cardiac cycle.

What does the P Wave indicate in the cardiac cycle?

The depolarization of the atria when the SA node fires and spreads electrical signals.

What is represented by the PQ Segment?

The time the electrical signal travels from the SA node to the AV node.

What does the QRS Complex mark in the cardiac cycle?

The firing of the AV node and the ventricular depolarization.

What does the Q Wave correspond to?

The depolarization of the interventricular septum.

What does the R Wave represent?

The depolarization of the main mass of the ventricles.

What is indicated by the S Wave?

The last phase of ventricular depolarization at the base of the heart.

What is occurring during the ST Segment?

It reflects the plateau in the myocardial action potential when the ventricles contract.

What does the T Wave represent in the cardiac cycle?

The ventricular repolarization.

What does the term 'contractility' refer to?

The ability of the muscle cells to shorten or contract.

What does 'elasticity' mean in the context of heart function?

The ability of the heart to resume its shape after being stretched.

What condition leads to edema due to excess fluid in the tissues?

Congestive heart failure.