6.4.1 Distinguish between ventilation, gas exchange and cell respiration. ventilation: the process of bringing fresh air into the alveoli and removing stale air. gas exchange: human must take in oxygen from their surrounding and release carbon dioxide, this process of swapping one gas with another is called gas exchange. cell respiration: the controlled release of energy in the form of ATP from organic compounds in cells. 6.4.2 Explain the need for a ventilation system. Diffusion of oxygen and carbon dioxide happens because there are concentration gradients of oxygen and carbon dioxide between the air and the blood.
polysaccharide polÂ·yÂ·sacÂ·chaÂ·ride (pÅl'Ä-sÄk'É-rÄ«d') or polÂ·yÂ·sacÂ·chaÂ·rid (-rÄ­d) or polÂ·yÂ·sacÂ·chaÂ·rose (-rÅs', -rÅz') n. Any of a class of carbohydrates, such as starch and cellulose, consisting of a number of monosaccharides joined by glycosidic bonds. Also called glycan.
A common polysaccharide found in plants would be starch. Starch is made up of roughly 20% amylose and 80% amylopectin which both have a very similar structure except amylope â¦ ctin is made up of much larger molecules. It is the energy storage system like batteries.Another very common polysaccharide is cellulose.This is the main structural material. All of these molecules are made up of glucose molecules bonded together. In starch the bonds are alpha while in cellulose beta. This sort of means right handed for starch and left handed for cellulose.nother very common polysaccharide is cellulose. This is the main structural material. All of these molecules are made up of glucose molecules bonded together. In starch the bonds are alpha while in cellulose beta. This sort of means right handed for starch and left handed for cellulose.