The Heart

The heart is part of the ....... system.

• circulatory
• digestive
• nervous
• respiratory

Humans have a ....... circulatory system.

• single

• flexible
• open
• double

The right side of the heart pumps blood to the ........

• lungs
• liver
• stomach
• brain

The left side of the heart pumps blood to....

• the lungs

• the heart

• Mars
• the rest of the body

Blood enters the body through the ....

• vena cava

• aorta

• pulmonary artery

The blood enters through the vena cava and passes into the .......... ............, then into the .......... ............. .

• left atrium, left ventricle
• aorta, pulmonary artery
• pulmonary vein, pulmonary artery
• right atrium, right ventricle

The muscles in the right ........... wall push the blood through the pulmonary ........... which carries the blood to the lungs.

• ventricle, vein

• ventricle artery,

• atrium, artery

• atrium, vein

Blood from the lungs enters the heart through the ................. vein, and passes through the .......... atrium and into the left .................... .

• pulmonary, left, ventricle

• superior vena cava, left, atrium

• aorta, right, ventricle

• inferior vena cava, right, ventricle

Muscles in the left ventricle wall push the ............ through the ........... which takes the blood to ............... .

• capillaries, liver, kidneys
• artery, lungs, brain
• blood, aorta, rest of the body

• veins, lungs, heart

Blood enters the heart through the .......... ....... and passes into the ........... ................ .

• veins, atrium chambers

• arteries, ventricle chambers
• capillaries, pulmonary artery
• lymphatic vessels, aorta