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A vein carries blood to the _____.
________ carry blood away from the heart.
A ____ is part of the circulatory system of the body carrying oxygen depleted blood towards the heart.
___________ link together veins and arteries.
The heart pumps blood from the left ventricle into the _____ through the aortic valve.
The _________ artery carries deoxygenated blood from the heart to the lungs.
The right and left _________ is at the bottom of the heart.
The _____ are found at the top of the heart.
The heart is made of _______ muscle.
Veins contain ______ to prevent backflow of blood.