EVERYDAY SCIENCE

Detailed explanation-1: -In passive transport, substances move from an area of higher concentration to an area of lower concentration in a process called diffusion. A physical space in which there is a different concentration of a single substance is said to have a concentration gradient.

Detailed explanation-2: -Their movement from a region of high concentration to a region of low concentration is accomplished by special proteins in the membrane.

Detailed explanation-3: -There is a form of passive transport called facilitated diffusion. It occurs when molecules such as glucose or amino acids move from high concentration to low concentration facilitated by carrier proteins or pores in the membrane.

Detailed explanation-4: -Facilitated diffusion is the passive movement of substances, such as biological molecules or ions, across a plasma membrane by means of a transport protein located in the plasma membrane.

Detailed explanation-5: -Carrier proteins are responsible for the facilitated diffusion of sugars, amino acids, and nucleosides across the plasma membranes of most cells.