direction of blood flow (blood circulation )

Question 1

what is the blood system of humans referred to

Answer 1

it is referred to as a closed blood system because the blood never leaves the blood vessels

Question 2

how many circulation systems are there

Answer 2

there are two main routes of blood flow

Question 3

name the circulation systems

Answer 3

pulmonary circulation and systemic circulation

Question 4

what happens during pulmonary circulation

Answer 4

the blood flows from the heart to the lungs and back to the heart

Question 5

what happens during systemic circulation

Answer 5

the blood flows from the heart to all the parts of the body and back to the heart

Question 6

what happens when the right ventricle contracts

Answer 6

deoxygenated blood is forced to the pulmonary artery .

Question 7

what is the reason for the pulmonary arteries breaking into two larger arteries

Answer 7

one artery goes to each lung and than into smaller arterioles which.in the lungs the arterioles carry blood to the lungs .in the lungs the arterioles break up into capillaries

Question 8

explain the diffusion between the capillaries and lungs

Answer 8

carbon dioxide from the blood in the capillaries in the capillaries diffuses into the lungs and oxygen from the lungs diffuses into the blood in the capillaries

Question 9

explain what happens after the diffusion between the capillaries and lungs

Answer 9

the capillaries join to form venules which form larger veins , which in turn join to form the pulmonary veins .

Question 10

what is the function of the pulmonary veins

Answer 10

pulmonary veins transport the oxygenated blood to the left atrium of the heart

Question 11

explain what happens when the left ventricle contracts

Answer 11

blood carrying food and oxygen (oxygenated blood ) is forced into the aorta and its branches (large and smaller arteries ) to all the parts of the body

Question 12

following up from the left ventricle contracting what happens in the tissue

Answer 12

the arteries break up into arterioles and then into capillaries

Question 13

how does the blood in the systemic circulation became deoxygenated

Answer 13

oxygen and food from the capillaries diffuse into the cells and are used up by the cells . carbon dioxide given off by the cells diffuse into the blood capillaries and becomes deoxygenated blood

Question 14

how is blood carried to the right atrium of the heart

Answer 14

capillaries join to form venules which in turn join to form veins ,these veins pour their blood into the superior and inferior vena cava ,which carry blood to the right atrium of the heart

Question 15

name the two specialized parts of the systemic circulation

Answer 15

the coronary and portal circulations

Question 16

what arises from the aorta

Answer 16

coronary arteries

Question 17

what happens as the coronary arteries break up into capillaries

Answer 17

they pass into the walls of the atria and ventricles and carry oxygen and food to the heart muscles

Question 18

what happens to the capillaries in the coronary circulation as they join

Answer 18

they form coronary veins which carry the deoxygenated blood back to the right atrium

Question 19

portal circulation

to where does the aorta crry the oxygenated blood

Answer 19

to the alimentary canal (stomach and intestines )

Question 20

portal circulaton

what happens when the arteries break into arterioles and than into capillaries

Answer 20

capillaries absorb digested food from the alimentary canal .

Question 21

portal circulaton

what happens when the arteries break into arterioles and than into capillaries

Answer 21

capillaries absorb digested food from the alimentary canal .

Question 21

portal circultion

explain how the blood is carried through the infrior vena cava to the right atruim of the heart

Answer 21

capillaries join to form venules which in turn join to form larger veins .all the larger veins join to form one single large vein called the hepatic portal vein . from the liver ,the blood is carried away by several hepatic veins to the inferior vena cava and then to the the right atruim of the heart