BISC306 Lecture Notes - Lecture 1: Freezing-Point Depression, Epithelium, Covalent Bond
9 Sep 2017
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Document Summary
Eumetazoans ( most of the rest, including mammals) have true tissues. Animals are eukaryotic multicellular heterotrophs: epithelia form barriers, create compartments. Regulation of the internal environment to maintain relatively stable and constant conditions. Regulation (nervous system and endocrine system) and feedback control. Negative feedback (regulation of temperature) and set point (ex. Thermostat that produces heat as a consequence of a temperature reading. Hydrogen bonds are relatively weak (~4. 5 kcal/mole) compared to covalent bonds (~110kcal/mole) Depend on the number of solute molecules in a given volume. Relationship between molarity and colligative properties is complex for electrolytes. Compounds that ionize in water are called electrolytes. Electrolytes increase the electrical conductivity of a solution. Common electrolytes are salts (nacl, kcl), acids and bases. Ph decreases (becomes more acidic) in lower temp. In biological systems are weak acids and their salts. Most important in the regulation of blood plasma (hemoglobin) ph effects protein structure and enzymatic activity.
