EVERYDAY SCIENCE

Detailed explanation-1: -In a cell, water, oxygen and carbon dioxide molecules can pass directly through the cell membrane without requiring any energy along the concentration gradient. This is a form of simple diffusion.

Detailed explanation-2: -Diffusion is a process in which transport is driven by a concentration gradient. Gas molecules move from a region of high concentration to a region of low concentration. Blood that is low in oxygen concentration and high in carbon dioxide concentration undergoes gas exchange with air in the lungs.

Detailed explanation-3: -CO2 diffuses down its pressure gradient, moving out of the capillaries and entering the alveoli. Oxygen and carbon dioxide move independently of each other; they diffuse down their own pressure gradients.

Detailed explanation-4: -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-5: -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.