Question

The constant inward movement of oxygen into most cells is primarily due to:

a. primary active transport
b. secondary active transport
c. facilitated diffusion using carrier proteins
d. simple diffusion across the phospholipid bilayer
e. simple diffusion through channels

Answer 1

Oxygen primarily moves into most cells through simple diffusion.

Step-by-step explanation:

Prominent gas molecules like oxygen primarily move across the cell membrane through simple diffusion. Simple diffusion is a form of passive transport where molecules move from an area of higher concentration to an area of lower concentration. Since the cell membrane is made up of hydrophobic phospholipids, oxygen, being a small and hydrophobic molecule, can easily diffuse through the lipid bilayer of the membrane.