control cardiac cycle

Question 1

what is the cardiac cycle describe as

Answer 1

myogenic

Question 2

describe the control

Answer 2

sino-atrial node in wall right atrium
electrical impulse across both atria cause contract

non conductive tissue stops spread to ventricle allowing complete contraction atria

atrio-ventricular node at top septum picks up impulse and pass down bundle of his carries signal to apex

then passes up purkyne fibres cause ventricle contract to push blood out of arteries

Question 3

what is ecg

Answer 3

Monitor the electrical activity of the heart.

The trace of a healthy heart has a particular shape.

An irregular shape can show up problems such as:

arrhythmia (irregular heartbeat)
fibrillation (uncoordinated beat)
heart attack.