B2b- organisation of plants and animals (side two)

Question 1

problem- faulty valves- this causes blood to flow in both directions and blood now does not circulate effectivley. (2)

Answer 1

treatments
mechanical valves- lasts a long time but need to take medicine for life
biological valves (from animals)- lasts ten years and no medicine needed but surgery complicated

Question 2

problem- faulty pacemaker- heart rate incorrect

Answer 2

treatment

artificial pacemaker- regular check ups needed

Question 3

probem- heart failure

Answer 3

treatment
artificial heart, temporary while waiting for a donor- dont have to wait for a donor, however blood might clot and surgery complications
transplant of donor heart- have to wait for donor and a risk of operation

Question 4

problem- coronary heart disease: layers of fatty acids build up inside coronary arteries, blocking them. Blood flow now reduced resulting in lack of oxygen for heart

Answer 4

treatment
stent( metal mesh inserted in artery to keep open) effective for a long time but risks of surgery/heart attacks etc.
statins (drugs to reduce cholesterol which slows rate of fatty deposit build up)- reduces risk of strokes/heart attacks, however forgetting to take drug comes with bad side effects.

Question 5

what happens to your blood if you have faulty valves

Answer 5

causes blood to flow in both directions and blood does not circulate correctly now

Question 6

what does it mean if you have a faulty pacemaker

Answer 6

heart rate is incorrect

Question 7

what is coronary heart disease (2)

Answer 7

layers of fatty acids build up inside coronary arteries, blocking them
blood flow is now reduced resulting in lack of oxygen for the heart.