blood circulation in the heart

Question 1

why do we have valves in the heart?

Answer 1

to prevent the backflow of blood.

Question 2

what does the heart actually do?

Answer 2

pump blood (which contains oxygen and nutrients) around the body.

Question 3

where does de-oxygenated blood pump too?

Answer 3

the lungs so that it could gain oxygen.

Question 4

where does oxygenated blood pump too?

Answer 4

the rest of the body, where it then gives up its oxygen and becomes de-oxygenated.

Question 5

in which order does de-oxygenated blood pump through the heart?

Answer 5

the blood first flows into the vena cava, and then the blood flows into the right atrium. as the atrias contract, they push the blood into the right ventricle. as the ventricles contract, the blood pushes out of the pulmonary artery which travels blood to the lungs.

Question 6

in which order does oxygenated blood pump through the heart?

Answer 6

the blood first flows into the pulmonary vein, and then the blood flows into the left atrium. as the atrias contract, they push the blood into the left ventricle. as the ventricles contract, the blood pushes out of the aorta which travels blood to the rest of the body.

Question 7

describe the physical properties of an artery.

Answer 7

the lumen is narrow, the layer of muscle is thick and the layer of collegen fibres are thick.

Question 8

what is an artery’s job?

Answer 8

to carry de-oxygenated blood from the heart to the tissues in the body.

Question 9

describe the physical properties of a vein.

Answer 9

the lumen is wide, the layer of muscle and the outer layer is thin

Question 10

what is a vein’s job?

Answer 10

to carry de-oxygenated blood from the tissues to the heart.

Question 11

describe the physical properties of a capillary.

Answer 11

small lumen, the wall is only a single cell thick.