Absorption Of Matierals

Oxygen and nutrients from food must be absorbed into the bloodstream for respiration. Waste materials such as carbon dioxide, must be removed from cells into the bloodstream. Tissues contain capillary networks that allow the exchange of materials to a cellular level.

Surfaces involved in the absorption of materials have certain features in common: Large surface area Thin walls Extensive blood supply These increase the efficiency at which materials are absorbed.

The lungs are the gas exchange organs. consisting of a lots of alveoli providing a large surface area for gas exchange. Oxygen into the blood is exchanged for carbon dioxide out of the blood.

Oxygen and carbon dioxide are absorbed through the thin alveoli walls to or from the many blood capillaries.

In The small intestine which contains a large number of thin-walled villi to provide a large surface area for this absorption.

capillaries to absorb (fat) glucose and (protien) amino acids.

The lacteal absorbs (carbs) fatty acids and glycerol