BIOL 222 Study Guide - Quiz Guide: Starling Equation, Fibrin, Prolactin
Document Summary
The maintenance of a relatively stable internal environment: components and functions of regulatory mechanisms: receptors/ integration center (set point)/ effectors. Negative feedback: contains the homeostatic loop (receptor, integrator, effector). Positive feedback: the response is to change original measurement more in the direction it already was (ex: childbirth hormone causes contractions and become more frequent until child is born: autoregulation/extrinsic regulation. Autoregulation: cells automatically respond to changes in physiological parameters referred to as local control and does not require cell-to-cell communication via chemical signals or paracrine molecule signals e. g. blood flow (low 02, cells vasodilate) Extrinsic regulation: responses to change come from one of two systems, nervous (rapid responses with short duration) or endocrine (delayed responses with longer duration) All cellular structure and function depends upon proteins (dna only codes for proteins). hormones alter cellular processes by changing types, amounts (make more/less), and activities (of cellular proteins, turn on/off). Amino acid derived (enzyme controlled) tyrosine and tryptophane.
