Answer :
Final answer:
Passive diffusion is the key process for drug absorption and transport in the body, especially important when drugs are administered by inhalation.
Explanation:
Passive diffusion is the process where molecules move from regions of higher concentration to lower concentration without the need for cellular energy. This mechanism is essential for the movement of gases like O2 and CO2 across cellular membranes, aiding respiration and drug absorption.
When drugs are administered by inhalation, they undergo passive diffusion into the bloodstream through the alveoli, following a concentration gradient.
Passive diffusion allows for the movement of simple molecules and gases, such as CO2 and O2, across cell membranes based on concentration gradients, affecting drug absorption and transport in the body.
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