The heart

Question 1

Sinoatrial node (SA node)

Answer 1

Generates an electrical impulse that causes the atrial myocardium to contract and force blood into the ventricles.
Acts as a natural pacemaker. The electrical impulses are then distributed to the AV node.

Question 2

Atriovenricular node (AV node)

Answer 2

Causes a delay in the electrical impulses to allow the atrium to contract before contracting the ventricles. It then distributes the impulses to the Bundle of His.

Question 3

Bundle of His

Answer 3

Found in the septum of the heart. Distributes the impulses to the Purkinje Fibres.

Question 4

Purkinje Fibres

Answer 4

Found in the myocardium of the ventricles and once electrical impulses are distributed to them they cause a contraction in the ventricles, forcing the blood around the body.

Question 5

Cardiac output

Answer 5

The volume of blood leaving the left ventricle per minute.

Question 6

Stroke volume

Answer 6

The volume of blood that leaves the left ventricle per beat.

Question 7

Heart Rate

Answer 7

Number of heart beats per minute.

Question 8

Equation for cardiac output

Answer 8

Cardiac output = Stroke Volume * Heart rate

Question 9

Max HR

Answer 9

220 - age