homeostasis and cell function Flashcards
define homeostasis
refers to the maintenance of nearly constant conditions in the internal environment (condition in which the body’s internal environment remains relatively constant within limits
what factors need to be true for an organism to be in homeostasis
contains the optimum concentrations of gases, nutrients, ions, and water
has an optimal temperature
has an optimal pressure for the health of the cells
define stress
any stimulus that creates an imbalance in the internal environment
define feedback system
circular situation in which the information about the status of something is continually reported to a central control region
define gain
degree of effectiveness with which a control system maintains constant conditions
which of the following would have to be a transmembrane protein?
receptor protein, protein binding to the cytoskeleton, channel protein, phosphorylase
a channel protein
define unit membrane
phospholipid bilayer with cholesterol inserted among the phospholipids
define integral proteins
either inserted into the membrane on one side or the other or pass all thew ay through and are exposed on either side of the membrane (removing them would destroy the phospholipid bilayer)
define peripheral proteins
loosely attached to one surface of the membrane or the other and are easily removed
which organelles are associated with intracellular trafficking
smooth and rough ER
golgi apparatus
which organelles are associated with most ATP production
glycolysis: cytoplasm
ETC and Krebs: mitochondria
what does all protein synthesis begin with
free ribosome
which of the following organelles is directly associated with the synthesis of proteins for secretion
Rough ER
pits coated with _______ are often associated with endocytosis
clathrin
what does smooth ER do
storage organelle
important in creation and storage of lipids and steriods
