Unit 4 - Cardiovascular System

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The (1) side of the heart sends oxygen-poor blood to the lungs.
The (2) side of the heart pumps oxygen-rich blood to the body.
The (3) is the wall that separates the left and right sides of the heart.
The (4) is the large vein that carries oxygen-poor blood to the heart.
The right (5) is the upper heart chamber that receives oxygen-poor blood.
The (6) valve prevents the back-flow of blood from the between the right atrium and ventricle.
The right(7) is lower chamber of the heart that pumps the oxygen-poor blood to the lungs.
The (8) valve seals the right ventricle and prevents back-flow from the pulmonary artery.
The (9) is the blood vessel that carries oxygen-poor blood from the right ventricle of the heart to the lungs.
The (10) is the blood vessel that carries oxygen-rich blood from the lungs to the left atrium of the heart.
The (11) is the upper chamber of the heart that receives oxygen-rich blood from the lungs.
The (12) valve between prevents the back-flow of blood from the ventricle to the atrium.
The left (13) is the lower chamber of the heart that pumps the blood to the rest of the body.
The (14) carries oxygen-rich blood from the left ventricle of the heart to the body.
(15) carry blood away from the heart.
(16) carry blood back to the heart.
(17) are the smallest of the blood vessels and are where the body tissues receive oxygen and give up waste.
The (18) are the oxygen carriers of the blood.
The (19) is the liquid part of the blood which is mostly water and dissolved nutrients.
The (20) are the infection fighters of the blood.
The (21) are small cells which form clots and scabs to plug up damaged blood vessels.