the heart Flashcards
1
Q
Colour of oxygenated blood
A
bright red
2
Q
colour of deoxygenated blood
A
dark red
3
Q
How does a heart attack occur
A
when blood flow to muscles in parts of the heart stops
4
Q
How is the contraction and relaxation of the heart controlled
A
by impulses in the CNS
5
Q
Heart rate
A
number of beats per minute
6
Q
stroke volume
A
blood pushed into the aorta each beat (litres)
7
Q
Cardiac output
A
volume of blood pushed into the aorta each minute
8
Q
Equation for cardiac output
A
heart rate x stroke volume
9
Q
Cardiac output of someone who exercises a lot
A
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
