BSC 2011 Lecture Notes - Lecture 6: Digestive Enzyme, Blood Plasma, Microvillus
26 Jun 2016
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Document Summary
Pumps ions between uids on either side of the epithelium. Secretes substances such as hormones, mucus, digestive enzymes, milk, sweat. Serves sensory functions, including smell and taste: cell membranes separate the extra- and intracellular uids. Roles: pump ions between intra- and extra- cellular uid. Key roles in producing and receiving physiological signals. Division of labor requires a system for rapid transport of materials such as o2. Animals with high metabolic rates require high rates of o2 transport and have evolved sophisticated circulatory systems. Energy content of food can be measured by the amount of heat the food produces when completely burned in the presence of o2, producing co2 and h2o. Measures of heat energy: calorie-amount of heat needed to raise 1g of water 1c, kilocalorie (kcal)-1000 calories; food labels, joule-. 239calories. Metabolic rate-amount of energy an animal converts to heat per day. Three types of food molecules: lipids (fats and oil, carbohydrates, proteins.
