BSC-2010 Lecture Notes - Lecture 12: Proximal Tubule, Osmotic Concentration, Cell Nucleus
2 Dec 2016
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Regulating the internal environment part 1: bioenergetics and regulation of body temperature. Bioenergetics energy ow and transformation in an animal (1) organic molecules in food (2) digestion and absorption. Energy lose in feces (3) nutrient molecules in body cells. Basal (resting) metabolic rate (bmr) of mammals increases with body sized. Larger animals have more cells and tissue = greater o2 consumption. Basal metabolic rate (bmr) per unit o fmass decreases with body size of mammals. Individual cells of small animals consume more o2 per hour. Homeostasis (maintaining a constant internal environment): temperature regulation. The relationship between body temperature and environmental temperature in an aquatic endotherm and ectotherm. A nonliving example of negative feedback: control of room temperature. Room temp. at 20 degrees c, set point. Heat exchange between n organism and its environment. Human circadian clock: daily variations in core boyd temperature and melatonin (a hormone) Melatonin is a hormone that is secreted by the pineal gland (brain)
