The Closed Circulatory System. Humans have a closed circulatory system , typical of all vertebrates, in which blood is confined to vessels and is distinct from the interstitial fluid. The heart pumps blood into large vessels that branch into smaller ones leading into the organs.
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Blood from body enters
Arteries carry blood AWAY
from the heart
Blood from lungs enters
Veins carry blood
to the heart
(like ven in Spanish)
Right Ventricle sends blood
Left Ventricle sends blood
to rest of body
Blood Vessels -A network of tubes
The AV valves shown here are responsible for the Dub sound in the heart.
When the valves close, they slam together and make a dub sound.