Examlex
What word is best to substitute for the underlined words in the following sentence?
I always greet my wife when I come home.
Exercise
Physical activity that is planned, structured, and repetitive for the purpose of conditioning any part of the body, improving health, and maintaining fitness.
Alveolus
A small air sac within the lungs where the exchange of oxygen and carbon dioxide takes place during respiration.
Pulmonary Capillary
A small, thin-walled blood vessel located in the lungs where gas exchange between the blood and alveoli occurs.
Oxygen Diffusion
The movement of oxygen molecules from areas of high concentration to areas of low concentration, essential for respiratory processes in cells.
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