GENERAL HISTOLOGY

Detailed explanation-1: -Gases like carbon dioxide and oxygen can move across the cell membrane via diffusion. Diffusion is the movement of gas molecules from a region of higher concentration, to a region of lower concentration through a semi-permeable membrane.

Detailed explanation-2: -CO2 is gaseous molecule and hence it moves in and out of the cell freely by simple diffusion. Diffusion is a process in which the molecules interact and move from a region of higher concentration to a region of lower concentration.

Detailed explanation-3: -The walls of the alveoli share a membrane with the capillaries. That’s how close they are. This lets oxygen and carbon dioxide diffuse, or move freely, between the respiratory system and the bloodstream. Oxygen molecules attach to red blood cells, which travel back to the heart.

Detailed explanation-4: -Oxygen and carbon dioxide move across cell membranes via simple diffusion, a process that requires no energy input and is driven by differences in concentration on either side of the cell membrane.

Detailed explanation-5: -An example of passive transport is diffusion, the movement of molecules from an area of high concentration to an area of low concentration. Sometimes, molecules cannot move through the cell membrane on their own.