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 contain more than ten monosaccharide units. Definitions of how large a carbohydrate must be to fall into the categories polysaccharides or oligosaccharides vary according to personal opinion. Polysaccharides are an important class of biological polymers.Their function in living organisms is usually either structure-or storage-related. Starch (a polymer of glucose) is used as a storage polysaccharide in plants, being found in the form of both amylose and the branched amylopectin.In animals, the structurally similar glucose polymer is the more densely branched glycogen, sometimes called 'animal starch'.olysaccharides contain more than ten monosaccharide units. Definitions of how large a carbohydrate must be to fall into the categories polysaccharides or oligosaccharides vary according to personal opinion. Polysaccharides are an important class of biological polymers.