BIOD 121 module 2 exam Portage learning SPRING 2024

protein digestion 1. cooking 2. pepsin (in stomach) 3. cholecystokinin -CCK (small intestine) - travels to pancreas, releases trypsin back to SI 4. trypsin - breaks peptide chains 5. amino acids absorbed through portal vein to liver 2. digestion transforming food into basic nutrients that can be absorbed and used by the body 3. sensory stimuli before digestion cognition sound odor appearance taste 4. peristalsis Involuntary waves of muscle contraction that keep food moving along in one direction through the digestive system. 5. digestive enzymes catalyze the chemical reactions required to break down food particles into smaller parts, which prepares the nutrients for absorption 6. mucosa intestinal wall, innermost layer 7. circular and longitudinal muscles mix and move food along the GI tract 8. passive diffusion substances move without energy high to low concentration 9. facilitated diffusion special protein carrier is required to help substances cross in or out of the cell high to low concentration 10. active transport requires energy low to high concentration