adj. needed to stay alive or for something to be done
The heart is one of the five vital organs in the human body.
vessel
n. a tube-like part of the body that carries blood
Blood is carried through the body in tubes called vessels.
artery
n. one of the thick tubes that carry blood from the heart to other parts of the body
Vessels that carry blood away from the heart are arteries.
vein
n. a tube that carries blood to the heart from the other parts of the body
Vessels that carry blood back to the heart are veins.
vitamin
n. a natural thing in food that keeps your body healthy
Blood carries many important things, such as vitamins and oxygen, throughout the body.
oxygen
n. large part of the air on earth and is needed to keep most living
Blood carries many important things, such as vitamins and oxygen, throughout the body.
wrap
v. to encircle something
If your blood vessels were connected end to end, they would wrap around the Earth twice.
organ
n. a part of the body
The heart is one of the five vital organs in the human body.
necessary
adj. needed in order to achieve a particular result
These organs are necessary for humans to stay alive.
understand
v. to know the meaning of something that someone says
So, it’s important to understand how the heart functions.
function
v. to operate for a purpose
So, it’s important to understand how the heart functions.
chamber
n. a closed space inside something
Inside the heart, there are four parts called chambers.
empty
v. to remove all of something from something else
Then, the heart empties the chambers.
pump
v. to make liquid or gas flow
It pumps blood from the chambers throughout the body.
carry
v. to move it from one place to another
Blood is carried through the body in tubes called vessels.
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