CAS BI 315 Lecture 1: : CAS BI 315 Lecture 1
22 Jan 2019
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4) evolutionary changes alter gene freq . over generations ex adaptation to high altitude developmental. Homeostasis buffer internal environment from changes in external environment ex hunger increased breathing. I heart rate challenge variability from environment meet. Challenge physiologically to face external do not have. Static internal environment want to keep internal environment w/ in acceptable limits ex. 3 major responses to lower room temp vasoconstriction constricting blood vessels. Of body composition proteins membranes lipids nucleic acids macromolecules carbohydrates soluble important for metabolism. Storage structure cell cell communication lipids hydrophobic important for storage cell membranes c cell. E form mi cells nucleic acids important for storage expression. Skin catalytic role catalyze rxns by lowering activation energy ligand binding kinetics give upper limit threshold for rxn rate regulatory role enzymes c hormones receptors transcription neurotransmitters factors homeostasis from internal regulatory proteins feedback regulation negative feedback outcome.
