BIOL 204 Lecture Notes - Lecture 12: Parietal Cell, Chemotroph, Deep Sea
Document Summary
Essential nutrients: obtain pre assembled organic molecules and minerals (vitamins, minerals, essential amino acids, essential fatty acids) Herbivores: feeds on plants: dentition: premolars & molars crush and shred tough plant material / canines & incisors modified for biting plants. Carnivores: feeds on flesh: dentition: canines & incisors for killing prey and ripping flesh / premolars & molars for crushing and shredding. Omnivores: feeds on both: (human) dentition: incisors biting / canines tearing / premolars grinding / molars - crushing. Steps in processing food: ingestion: mechanical digestion, ways animals ingest food: Suspension feeders: eat particles in the water. Coprophagy: eating fecal material: digestion: chemical digestion (enzymatic hydrolysis, extracellular digestion: (outside the cell) Digestive enzymes are released from a gland cell. [dorsal folds enhance absorption]: accessory glands in humans: Salivary glands, pancreas, liver: the human stomach: Gastric glands (contains 3 types of cells) Chief cell (secretes pepsinogen the inactive precursor of pepsin: pepsin: begins the chemical digestion of proteins.
