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.
Disaccharides Disaccharide carbohydrates are made up of two monosaccharide units linked together. When two glucose molecules are linked together they form the disaccharide, maltose (Figure D). Polysaccharides When many monosaccharide units are linked together, the resulting carbohydrate is called a polysaccharide.Three important polysaccharides are starch, cellulose, and glycogen which are all made up of glucose molecules linked in different arrangements.arbohydrates are grouped into three categories: monosaccharides, disaccharides, and polysaccharides. Monosaccharides A monosaccharide is a single sugar unit. The most common monosaccharides are made up of six carbon atoms and are called hexoses. Glucose is an example of a hexose (Figure C).