LIFESCI 2 Study Guide - Final Guide: Endoplasmic Reticulum, Myosin Head, Loose Connective Tissue
Document Summary
Extracellular fluid allows cells to get nutrients and excrete waste without being exposed to harsh external environment. Development of internal environment allowed cell specialization cell does not have to provide for all of its own needs. Negative feedback: effectors reduce or reverse the thing that created error signal (most common, ex: fever. Positive feedback: amplifies the response; increases the error signal/ deviation from set point, ex: sexual impulse, pregnancy contractions. Feedforward information: change the set point; anticipates change in the internal environment before change occurs, ex: anxiety before a test. Ectotherms: body temp is determined by external source of heat, if outside is cold, then animal internally is colder regulates its behavior instead of internal heat production (move to warmer area, ex: reptiles. Heterotherm: both, bears hibernate in winter (ectotherm) but fine in summer (endotherm) Muscle contracts slightly small tremors atp consumed.
