The Heart Flashcards
1
Q
What is myogenic contractions?
A
Myogenic contractions is the way that the heart contracts and relaxes rhythmically involuntarily
2
Q
How long does one heartbeat last?
A
0.8 seconds
3
Q
What contractions occur in the heart?
A
Systole = Contractions Diastole = Relaxation
4
Q
What is the process of the cardiac cycle?
A
Atrial systole – Ventricular systole – Diastole
5
Q
What is Atrial Systole?
A
Atrium walls contract and the blood pressure in the atria increases, pushing blood through the tricuspid and bicupspid valves into the ventricles.
6
Q
What is the sino-atrial node (SAN)?
A
It is a cluster of specialised cardiac cells on the wall of the RIGHT atrium, acting as a pacemaker.
