Question

Where is oxygen absorbed by red blood cells?
A
Diaphragm
B
Nose
C
Alveoli
D
Trachea

Answer 1

$\boxed{\textbf{\mathbb{B. \: Alveoli}}}$

• The Oxygen inhaled by us is absorbed by Red Blood Cells (RBC's) in the alveoli.

• At the same time, the Carbon Dioxide from Red Blood Cells is collected by Alveoli and then, exhaled out.

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• The 2 gases get exchanged by the process called Diffusion.

1. Diffusion is the movement of gases from higher concentration to lower concentration.

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• To facilitate and make diffusion easier, Alveoli have a thin Semi-Permeable membrane.