LIFESCI 15 Lecture Notes - Lecture 12: Constipation, Pepsin, Calorie
Document Summary
Diets and feeding mechanisms vary among animal species. Herbivores- eat plant material exclusively (zebras, tortoises) Carnivores- eat only animals or animal products (lions, spiders) But the processing and deriving of energy from food is always the same. Calorie- enough energy to raise 1 gram of water by 1 c. Varies depending on how big you are because you have more cells that need food and on level of activity. Energy needed to maintain life without activity. Shrews: 35x as high, heart rate is about 500 beats per minute because of their body temperature and size. 5g shrew x (cid:2871)(cid:2873) (cid:3030)/ x (cid:2870)(cid:2872) (cid:3031) x 2 (for activity) = 8. 4 kcals. Calories to burn 1 g carb or protein- 4. Calories to burn 1 g fat- 9. Preference for fats decreases the amount of food an organisms must find and eat. Basal metabolic rate is the energy expenditure necessary to keep a resting animal alive, depending on the species.
