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.
Polysaccharides are carbohydrate polymers consisting of tens to hundreds to several thousand monosaccharide units. All of the common polysaccharides contain glucose as the monosaccharide unit.Polysaccharides are synthesized by plants, animals, and humans to be stored for food, structural support, or metabolized for energy.he structure of glycogen consists of long polymer chains of glucose units connected by an alpha acetal linkage. The graphic on the left shows a very small portion of a glycogen chain. All of the monomer units are alpha-D-glucose, and all the alpha acetal links connect C # 1 of one glucose to C # 4 of the next glucose.