Question

Identify and explain four factors which assist gas exchange. (4 marks) The

first 1 is done for you.

The example is : The surface of the alveoli and the walls of the blood capillaries are only 1 cell thick which allows for rapid diffusion to take place.

PLZ HELP xxx

Answer 1

The factors on which the gaseous exchange depends are:

Surface Area Of The Membrane: The larger the surface area of a membrane, the more will be the gaseous exchange. Hence, surface area is directly proportional to the rate of gaseous exchange.

Thickness of the membrane: The more thick the membrane will be, the lesser the amount of gases will be able to diffuse through it. Hence, gaseous exchange and thickness of a membrane are inversely proportional.

The Distance Of Diffusion: The distance across which air and blood have to travel to diffuse also determines the rate of gaseous exchange