The Journey of an Oxygen Molecule
Questions:
5
Grade:
5
Words:
86
One day, an oxygen molecule entered our body through the nostrils. It traveled down a windpipe and reached two big air-filled spaces, the lungs. In the lungs, it met tiny air sacs and was quickly grabbed up by a red blood cell. The red blood cell carried the oxygen molecule to the heart, which sent it to all parts of the body. After it was used up, it became a carbon dioxide molecule and was carried back to the lungs, and then we breathed it out.
Question 1
What does the oxygen molecule become after it is used up?
A
Carbon monoxide
B
Nitrogen
C
Hydrogen
D
Carbon dioxide
Explanation. After the oxygen molecule is used up, it becomes a carbon dioxide molecule.
E
Helium
Question 2
Where does the oxygen molecule travel to after it enters through the nostrils?
A
Stomach
B
Lungs
Explanation. The oxygen molecule travels down a windpipe and reaches the lungs after it enters through the nostrils.
C
Brain
D
Heart
E
Liver
Question 3
What grabs the oxygen molecule in the lungs?
A
White blood cell
B
Plasma
C
Platelet
D
Red blood cell
Explanation. In the lungs, the oxygen molecule is quickly grabbed up by a red blood cell.
E
Bacteria
Question 4
Where is the oxygen molecule sent to from the heart?
A
Back to the lungs
B
Out of the body
C
Brain only
D
All parts of the body
Explanation. The heart sends the oxygen molecule to all parts of the body.
E
Just to the muscles
Question 5
What happens to the carbon dioxide molecule after it is carried back to the lungs?
A
It is used again
B
It becomes an oxygen molecule
C
It is breathed out
Explanation. The carbon dioxide molecule is breathed out after it is carried back to the lungs.
D
It is stored in the lungs
E
It travels to the heart
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