BISC 101 Lecture Notes - Lecture 6: Symporter, Hypothalamus, Antiporter
8 Aug 2016
School
Department
Course
Professor
Document Summary
Nutrient: a substance that an organism needs to remain alive. Humans require essential nutrients (nutrients that cannot be made and must be obtained in diet) 2) digestion: breakdown of food into smaller molecules. 4) elimination: disposal of waste (absorb water) Suspension feeders: filter small organisms/bits of organic debris from water using cilia/mucus lined nets and other structures. Deposit feeders: swallow organic rich sediments and other deposited material. Fluid feeders: suck or lap up fluid (blood/nectar/sap) Mass feeders: seize/manipulate chunks of food by using mouthparts such as jaws/teeth/beaks/special toxin-injecting organs. Mammals only animal to chew food and swallow distinct packets. Diversification in jaw size to exploit wide range of food. Complex multipart skull/jawbones have evolved in snakes. Natural selection is strong for food capture because obtaining nutrients is vital for fitness (offspring) Evolution is not progressive (do not get better overtime) Adaptation is not perfect (example: wisdom teeth) Salivary glands: make salivary amylase for carbohydrates and lubricating mucus.
