Cell Membranes Membranes?are vital structures found in all cells The?cell surface membrane?creates an enclosed space separating the internal cell environment from the external environment, and?intr...
The Mammalian Lung: Structure & Function The?lungs?of air-breathing animals provide an ideal exchange surface for the diffusion of gases The lungs are located in the?thorax, or?chest cavity Som...
Fick's Law of Diffusion Fick's Law relates the rate of diffusion to the concentration gradient, the diffusion distance and the surface area This relationship can be represented by the following equ...
Properties of Gas Exchange Surfaces All organisms need to?exchange gases with their environment,?e.g. Aerobic?respiration?requires oxygen and produces carbon dioxide as a waste product Photosynthes...
1.2.11 Practical: Vitamin C Content Vitamin C is found in green vegetables, fruits, and potatoes It is essential for a healthy diet The chemical name for vitamin C is?ascorbic acid Ascorbic acid is...
Lipids & CVD A?risk factor?is any factor that?increases the chance?of developing a particular condition or disease An increase in a risk factor does not guarantee the development of disease, bu...
Lipids Lipids Lipids are macromolecules that contain carbon, hydrogen and oxygen atoms. Unlike carbohydrates, lipids contain a lower proportion of oxygen Lipids are?non-polar?and?hydrophobic?(insol...
Polysaccharides: Structure Starch, glycogen, and cellulose are examples of?polysaccharides Polysaccharides are carbohydrate polymers; repeated chains of many monosaccharides?joined by glycosidic bo...
Disaccharides: Structure Two monosaccharides?can join together via?condensation reactions?to form?disaccharides A condensation reaction is one in which two molecules join together via the formation...
