Unit 1- The CV System KO

Question 1

Heart rate

Answer 1

Beats per minute

Question 2

Stroke volume

Answer 2

Volume of blood ejected from the left ventricle per beat

Question 3

Cardiac output

Answer 3

Volume of blood ejected from the left ventricle per minute
HR x SV = Q
Measured in L/min

Question 4

Venous return

Answer 4

The return of blood to the heart

Question 5

Starling’s law

Answer 5

Increased venous return increases the stretch of ventricle walls and force of contraction and therefore stroke volume

Question 6

Myogenic

Answer 6

The capacity of the heart to generate its own electrical impulse

Question 7

Cardiac cycle

Answer 7

The process of cardiac muscle contraction and the movement of blood through its chambers
The events of one heart beat

Question 8

Systole

Answer 8

Contraction phase of the cardiac cycle

Question 9

Diastole

Answer 9

Relaxation phase of the cardiac muscle in the cardiac cycle

Question 10

The conduction system

Answer 10

Structures in the cardiac muscle which create and transmit an electrical impulse to initiate the conduction system and fires it through the atria walls causing them to contract

Question 11

Atria-ventricular node (AV node)

Answer 11

Collects and delays the electrical impulse to allow the atria to finish contracting

Question 12

Bundle of His

Answer 12

Structure in the septum of the heart which conducts the electrical impulse

Question 13

Bundle branches

Answer 13

Transmits the impulse left and right at the base of the heart towards each ventricle

Question 14

Purkinje fibres

Answer 14

Fibres which distribute the electrical impulse through the heart’s ventricle walls causing them to contract