BIOL 4310 Study Guide - Midterm Guide: Phase Response Curve, Circadian Rhythm, Zeitgeber
1 Mar 2020
School
Department
Course
Professor
Document Summary
Actogram = for plotting rhythmic activity (is double plotted with two days per line, and the same day will show up in two rows allows for easier analysis of patterns) Almost all eukaryotes and some prokaryotes have circadian rhythms. Oscillator = mechanism driving clock (ttfl/ptfl), rhythm = output result of clock, input can reset the clock (ex light) Acrophase = peak of rhythm, mesor = average value. Phase = time of occurrence relative to an outside reference (ex. dusk/dawn), can be measured in degrees or circadian hours. Damping = progressive decrease in amplitude of rhythm. Zeitgeber = time giver input that is used to entrain a rhythm to a certain cycle (ex day/night cycle, light = zeitgeber, entrained period = t = 24 hr normally). Without zeitgeber/stimulus, will free-run (free-running period = tau) No rhythm (arrhythmic) occurs when pineal gland removed from sparrows, Masking = when response occurs directly to stimulus (ex is active in light because woken by light).
