When we breathe we inhale oxygen, , and exhale carbon dioxide, , plus water vapor, O. Which likely has more mass, the air that we inhale or the same volume of air we exhale? Does breathing cause you to lose or gain weight?
A)The air we inhale has more mass; Breathing causes you to lose weight.
B)The air we exhale has more mass; Breathing causes you to lose weight.
C)The air we inhale has more mass; Breathing causes you to gain weight.
D)The air we exhale has more mass; Breathing causes you to gain weight.

Question

When we breathe we inhale oxygen,  , and exhale carbon dioxide,  , plus water vapor,  O. Which likely has more mass, the air that we inhale or the same volume of air we exhale? Does breathing cause you to lose or gain weight?
A)The air we inhale has more mass; Breathing causes you to lose weight. 
B)The air we exhale has more mass; Breathing causes you to lose weight. 
C)The air we inhale has more mass; Breathing causes you to gain weight. 
D)The air we exhale has more mass; Breathing causes you to gain weight.

Quizplus · Accepted Answer

The air we exhale has more mass due to the presence of carbon dioxide and water vapor. However, breathing does not cause us to lose or gain weight significantly as the mass of air inhaled and exhaled is relatively small compared to the overall mass of our body. The weight loss or gain is mainly determined by the balance between calories consumed and expended through physical activity.

When We Breathe We Inhale Oxygen, , and Exhale