the heart

Question 1

Colour of oxygenated blood

Answer 1

bright red

Question 2

colour of deoxygenated blood

Answer 2

dark red

Question 3

How does a heart attack occur

Answer 3

when blood flow to muscles in parts of the heart stops

Question 4

How is the contraction and relaxation of the heart controlled

Answer 4

by impulses in the CNS

Question 5

Heart rate

Answer 5

number of beats per minute

Question 6

stroke volume

Answer 6

blood pushed into the aorta each beat (litres)

Question 7

Cardiac output

Answer 7

volume of blood pushed into the aorta each minute

Question 8

Equation for cardiac output

Answer 8

heart rate x stroke volume

Question 9

Cardiac output of someone who exercises a lot

Answer 9

Exercise increases ventricle size and strength of heart muscle
they will have bigger stroke volume and so their heart won’t have to beat as much