The Heart

Question 1

where is the pulmonary artery and what does it carry?

Answer 1

• top right, connected to ventricle (heart right)

- carries deoxygenated blood to the lungs

Question 2

where is the vena cava and what does it carry?

Answer 2

• right atrium (heart right)

- carries deoxygenated blood from the body

Question 3

where is the aorta and what does it carry?

Answer 3

• top left, connected to ventricle (heart left)

- carries oxygenated blood to the body

Question 4

where is the pulmonary vein and what does it carry?

Answer 4

• left atrium (heart left)

- carries oxygenated blood back from the lungs

Question 5

when do the atrioventricular valves open?

Answer 5

they open when the pressure is higher in the atria than in the ventricles

Question 6

when do the semi-lunar valves open?

Answer 6

when the pressure is higher in the ventricles than in the blood vessels leaving the heart

Question 7

what is diastole?

Answer 7

the relaxation of the heart

Question 8

what happens during diastole?

Answer 8

• atria relax and fill with blood so pressure in atria increases
• ventricles are relaxed
• SL valves are closed
• AV open
• some blood enters ventricles due to gravity

Question 9

what is systole?

Answer 9

the contraction of the heart

Question 10

what happens during atrial systole?

Answer 10

• the pressure in the atria increases til it is greater than the pressure in ventricles
• atria contract forcing remaining blood into ventricles
• ventricles remain relaxed
• SL valves are closed
• AV are open

Question 11

what happens during ventricular systole?

Answer 11

• atria relax
• ventricles contract
• SL valves open
• AV close
• blood is pushed away from the heart