23

Front 1

valve

Back 1

a bodily structure that closes temporarily a passage or orifice or permits movement of fluid in one direction only.

Hint 1

Front 2

artery

Back 2

any of the muscular-walled tubes forming part of the circulation system by which blood is conveyed from the heart to all parts of the body.

Hint 2

Front 3

vein

Back 3

any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart.

Hint 3

Front 4

aorta

Back 4

the main artery of the body, supplying oxygenated blood to the circulatory system. In humans it passes over the heart from the left ventricle and runs down in front of the backbone.

Hint 4

Front 5

capillary

Back 5

any of the fine branching blood vessels that form a network between the arterioles and venules.

Hint 5

Front 6

ventricle

Back 6

a hollow part or cavity in an organ.

Hint 6

Front 7

vena cava

Back 7

a large vein carrying deoxygenated blood into the heart.

Hint 7

Front 8

atria

Back 8

each of the two upper cavities of the heart from which blood is passed to the ventricles. The right atrium receives deoxygenated blood from the veins of the body; the left atrium receives oxygenated blood from the pulmonary vein.

Hint 8

Front 9

eft ventricle

Back 9

The left ventricle is one of four chambers of the heart. It is located in the bottom left portion of the heart below the left atrium, separated by the mitral valve. As the heart contracts, blood eventually flows back into the left atrium, and then through the mitral valve, whereupon it next enters the left ventricle.

Hint 9

Front 10

deoxygenated blood

Back 10

Deoxygenated blood is then pumped by the right ventricle to the lungs via the pulmonary artery which is divided in two branches, left and right to the left and right lungs respectively. Blood is oxygenated in the lungs and returns to the left atrium through the pulmonary veins.

Hint 10