Heart

Question 1

muscular wall is thicker on the . . .

Answer 1

left to pump blood

Question 2

double circulation

Answer 2

one side carries blood from heart to lungs for gas exchange, other carries blood from heart to organs, blood sent at high pressure for areas of body to be oxygenised quickly

Question 3

AV valves closing

Answer 3

prevents back flow

Question 4

coordinated heart beat

Answer 4

each side fills/ empties at the same time

Question 5

coronary heart disease

Answer 5

arteries become narrow or blocked from deposit of fatty material on vessel lining, low O2 supply

Question 6

stent

Answer 6

metal mesh in artery opening vessel, 6 years

Question 7

statins

Answer 7

pills, lowers deposit of fatty material and blood cholesterol

Question 8

valves

Answer 8

do not open fully, mechanical replacement = 20 years of titanium or polymer + must take pills to prevent blood clots, biological = 15 years of pig or cattle or donor

Question 9

artificial pacemakers

Answer 9

irregular heart beat, electronic implant = 20-50 years, avoid devices, stimulates body with signals

Question 10

artificial heart

Answer 10

blood circulation and heart a recovery for 2 years whilst waiting for donor, expensive and risk of blood clots

Question 11

heart bypass

Answer 11

offers a reroute for blood when artery is blocked

Question 12

atria

Answer 12

top heart chambers where blood enters, contract to force blood to ventricles

Question 13

vena carva

Answer 13

deoxygenated blood travels into right atrium

Question 14

pulmonary vein

Answer 14

oxygenated blood from lungs to left atrium