BISC306 Lecture Notes - Lecture 1: Heterotroph, Protein Structure, Covalent Bond
14 Sep 2016
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Document Summary
Animals are eukaryotic multicellular heterotrophs: porifera-sponges that do not have true tissues, eumetazoans-rest of animals, including mammals that have true tissues. Tissue types: 1) nervous, 2) muscle-cardiac, skeletal, smooth, 3) epithelial (skin)-form barriers, within intestine, skin, and liver. Lumen of intestine-small hollow chamber; selectively permeable barrier; things pass through specifically. Liver-padic cells; gallbladder, liver, intestines are invaginations: 4) connective-some connective tissue secretes extracellular matrix; bone connects titssue. Homeostasis-regulation of internal environment to maintain relatively stable and constant conditions; multiple variables need to be maintained in order to create a steady state; requires atp & energy: feedback control. Positive feedback-often unstable; continuous system that continues loop to keep increasing or keep decreasing depending on situation. Readily forms hydrogen bonds (weak bonds, ~4. 5 kcal/mole) Water dissolves many polar & ionic substances: colligative properties of aqueous solutions-depends on number of solute molecules in a given volume, osmotic pressure, freezing point depression, boiling point elevation, depression of water vapor pressure.
