cardiac cycle

Question 1

describe the path of blood through the heart

Answer 1

vena cava, right atrium, right ventricle, pulmonary artery, lungs.
pulmonary vein, left atrium, left ventricle, aorta, body.

Question 2

name the valves in the heart and describe their location

Answer 2

atrioventricular valves (between the atrium and ventricle on both sides), sumi-lunar valves (in the arteries as blood leaves the heart)

Question 3

compare single and double circulation

Answer 3

single- blood passes through the heart once on each circuit of the body, double- blood passed trhough the heart twice on each circuit of the body

Question 4

what is diastole?

Answer 4

atria relax and begin to fill with blood, atrioventricular valves open, ventricles are relaxed so theres a lower pressure and blood enters from the atria, arterial pressure is high, semilunar valves close to prevent backflow of blood

Question 5

what is atrial systole?

Answer 5

atria contract so have a higher pressure, ventricles are relaxed so have a lower pressure, atrioventricular valves open, blood flows from atria to ventricles

Question 6

what is ventricular systole?

Answer 6

ventricles contract so there is a higher pressure, atria are relaxed so there is a lower pressure, atrioventricular valves close to prevent backflow of blood, semilunar valves open, blood flows from ventricles to arteries

Question 7

explain how valves control the flow of blood through the heart?

Answer 7

valves prevent the backflow of blood, they open when the pressure in front of the valve exceeds the pressure behind the valve.