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Science: Chapter 16-4
How does oxygen get into the blood?
9
Science
6th Grade
12/16/2007

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Cards

Term
What is air?
Definition
a mixture of gases
Term
What are the gases in air?
Definition

nitrogen - about 78%

oxygen - about 21%

argon - about 0.9%

carbon dioxide - about 0.03%

other gases - about 0.07%

Term
Which gas do you need?
Definition
oxygen
Term
What are tiny air sacs in the lungs?
Definition
alveoli
Term

Where are gases exchanged

in the lungs?

Definition
in the alveoli
Term
Describe the alveoli.
Definition

1) shaped like grapes

2) have thin walls

3) surrounded by many capillaries

4) place where oxygen and carbon dioxide are exchanged

Term
What is diffusion?
Definition

the movement of material

from areas of high concentration 

to areas of low concentration

Term

Inhaled air has more ___

than exhaled air.

Definition
oxygen
Term

Exhaled air has more ___

than inhaled air.

Definition

carbon dioxide

(it also has water vapor)

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