electrical impulses of the heart

Question 1

sinoatrial node

Answer 1

contracts cuaisng atria to contract, as atria contract, signal reaches 2nd node

located in right wall of atrium

stimulates muscle cell to contract and relax rhythmically
‘pacemaker’ sets the rate of contraction

Question 2

atrioventricular node

Answer 2

av node transmits signal to the bundle of His, these relay to perkinje fibres and initiates ventricle contraction

located at base of intraatrial septum