The PO₂ Decreases with Increasing Altitude Because of the

question 23

Multiple Choice

The PO₂ decreases with increasing altitude because of the

• A) lower percent of oxygen in the air.
• B) lower barometric pressure.
• C) higher percent of carbon dioxide in the air.
• D) higher percent of nitrogen in the air.

---

Definitions:

Pyrrolidine

An organic compound with the molecular formula C4H9N, consisting of a five-membered ring containing four carbon atoms and one nitrogen atom.

Lone Pair

A pair of valence electrons in an atom that is not shared with another atom and does not participate in bonding.

Physostigmine

An alkaloid used as a drug to treat glaucoma and anticholinergic poisoning, acting as a reversible cholinesterase inhibitor.

Glaucoma

A group of eye conditions that damage the optic nerve, often associated with increased pressure in the eye.