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This Week: Digestion and Nutrition Next Week: Plants are Cool 5/2 Exam 3 4/27 bonus 3 4/30 homework 4 (12 pts max) The Digestive System CB 41.15 light Photosynthesis CO2 + H2O C6H1206 + O2 sugar Cellular Respiration C6H1206 + O2 sugar CO2 + H2O energy ADP ATP Cells store energy in ATP Energy used Energy released Using ATP Complex molecules are broken down and then used to build needed molecules and to produce energy Animals take in complex molecules from the environment for energy production Animal digestion occurs outside of our cells. animal and fungal digestion occurs outside of our cells. Physical digestion: liquefying of food Chemical digestion: breaking large molecules into small molecules CB 41.21 Chewing and adding saliva begins the process of liquification Amylase in mouth Amylase begins the chemical digestion of carbs CB 41.16 The primary function of the stomach is food storage CB 41.15 In the stomach liquification continues. Pepsin in stomach Pepsin begins the chemical digestion of proteins. CB 41.17 enzyme activity Pepsin in stomach acid pH basic The Digestive System CB 41.15 Most chemical digestion occurs in the first part of the small intestine CB 41.17 The small intestine has a large surface area to aid in absorbption of nutrients CB 41.23 Absorption in the Small Intestine CB 41.23 The Digestive System CB 41.15 In liver, nutrient levels in blood are regulated Fats and lipids move through the lymphatic system, which returns fluid to blood directly before heart Lymph vessel small intestine CB 41.21 Different mouth and teeth structures can tell about an animal’s diet CB 41.26 Different mouth and teeth structures can tell about an animal’s diet CB 41.26 Grizzly bear teeth Carnivores have a short digestive system CB 41.27 Herbivores have a long digestive system Bears Both humans and grizzly bears are omnivores. Our digestive systems can tell us about our ancestors. CB 41.27 Humans This Week: Digestion and Nutrition Next Week: Plants are Cool 5/2 Exam 3 4/27 bonus 3 4/30 homework 4 (12 pts max)
