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Which option will be correct for the marked place in the diagram shown below?

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Which option will be correct for the marked place in the diagram shown below?

(a) Alveoli

(b) Arterial blood

(c) Venous blood

(d) Brain

I have been asked this question during an online exam.

Enquiry is from Mechanism of Action of General Anesthetics in portion Local & General Anesthetics, Opioid Analgesics, Drug Addiction and Drug Abuse of Drug Biotechnology

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The correct answer is (a) Alveoli

Easiest explanation: General anesthetics when allowed to inhaled 1st enter the lungs. Then they can readily pass through the alveolar walls and mix with the arterial blood. Furthermore, the depth of anesthesia induced by an inhaled anesthetic depends on the partial pressure of the anesthetics in the brain, and the rate of induction and recovery from anesthesia depends on the rate of change of partial pressure in the brain. These drugs are small lipid-soluble molecules that can cross the alveolar membrane easily. Move into and out of the blood based on the partial pressure gradient.

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