control of heartbeat

Question 1

step 1-san

Answer 1

SAN initiates a wave of excitation(electrical impulses)

Question 2

2:atrial systole

Answer 2

the wave spreads over the walls of the atria causing contraction

Question 3

3:prevent

Answer 3

wave is prevented from spreading to ventricles by a thin layer of connective, non conductive tissue

Question 4

4:avn

Answer 4

wave reaches atrioventricular node and the wave is delayed through the avn which allows the complete atrial contraction before ventricular contraction

Question 5

5:ventricular contraction

Answer 5

wave of excitation travels down conductive tissue in septum/bundle of his, this reaches base of ventricles causing contraction

Question 6

6:ventricular systole

Answer 6

wave travels through purkyne fibres up the side of ventricles

Question 7

7:diastole

Answer 7

heart relaxes, electrical impulse is terminated as there is no conductive tissue

Question 8

san

Answer 8

sino atrial node
area of right atrium that initiates wave of excitation