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Chapter 13 Vocabulary Words
Purposeful Design, Body Systems 1
17
Science
4th Grade
11/16/2011

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Term

cardiovascular system

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Definition
the system of vessels and organs that transports materials around the body
Term

 circulate

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Definition
to move in a repeated cycle
Term

atrium

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Definition
one of the two upper chambers of the heart
Term

 ventricle

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Definition
one of the two lower chambers of the heart
Term

 valve

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Definition

 

a flap of tissue that prevents the backflow of blood

Term

 deoxyenated

 

Definition
lacking oxygen
Term

 

oxygenated

Definition
rich in oxygen
Term

plasma

 

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Definition
the liquid portion of the blood
Term

red blood cell

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Definition
a cell that delivers oxygen to body cells
Term

white blood cell

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Definition
 a cell that defends the body against disease
Term

platelet

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Definition
a cell fragment that helps clot blood
Term

 artery

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Definition
a blood vessel that carries oxygenated blood away from the heart
Term

aorta

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Definition
the largest artery in the human body
Term

 vein

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Definition
a blood vessel that carries deoxygenated blood back to the heart
Term

immune system

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Definition
the body system that helps defend against diseases
Term

antibodies

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Definition
the proteins made by white blood cells that help destroy bacteria and viruses
Term

vaccine

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Definition
the dead or weakened bacteria or viruses that trigger production of antibodies
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