human have got closed blood circulation system n is double circulation ,veins carry deoygenated blood 4rm tissues to heart n arteries carries d oxygenated blood 2 cells n tissues...d herat exert pressure ,resulting in to flow of blood in blood vessel
The cardiovascular system circulates blood through the body.
In Englishman named William Harvey was first to describe that blood circulates by blood vessels.
Heart
veins
Because it circulates blood.
Blood...
circulates blood
The first scientist to describe that the heart circulates blood was the Arabian physician Ibn al-Nafis, in 1242 AD.
Blood circulates oxygen and nutrients through the brain.
Blood circulates oxygen and nutrients through the brain.
The heart is a pump that circulates the blood around the body
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