epithelial muscle

connective muscle tissue

cardiac muscle tissue

to ensure that the muscle contracts and relax

to ensure that the blood flows in one direction to the heart

contract

constrict

peacemaker

pacemaker

sinoatrial node

the tricuspid valve and the bicuspid valve close

the semilunar valves close

the tricuspid valve and the bicuspid valve close

the semilunar valves close

Right atrium

Right ventricle

Left atrium

Left ventricle

SA node $\rightarrow$ Purkinje fibers $\rightarrow$ AV node $\rightarrow$ Bundle of His

Bundle of His $\rightarrow$ Purkinje fibers $\rightarrow$ AV node $\rightarrow$ SA node

SA node $\rightarrow$ AV node $\rightarrow$ Bundle of His $\rightarrow$ Purkinje fibers

increasing the power of the impulse to maintain its flow through the Bundle of His

triggering the ventricles to expand in rhythm with the impulses from the Bundle Branches

allowing the atria time to push blood into the ventricles right before the ventricles contract

allowing the atria to contract simultaneously as soon as the SA node sends the impulse

Pacemaker blocks the transmission of the electrical impulse

Pacemaker causes relaxation of atria and ventricle

Heartbeat is already controlled by the pacemaker

The heartbeat is slowed down by the pacemaker

4

5

3

2

vein

artery

capillary

both veins and capillaries

vein

artery

capillary

capillary

artery

vein

none of the above

Diastolic

Pulse

Venous return

Systolic

heart attack

Pacemaker

stroke

angioplasty

heart attack

heart beat

heart stopper