Flashcards in Homeostasis Deck (73)
Homeostasis refer to the dynamic mechanisms that detect and respond to deviations in physiologic variables from their "set point" values by initiating effector responses that restore the variable to the optimal physiological range.
Is homeostasis an energy consuming state?
What is constancy?
What is Equilibrium?
Variations around a normal
What is a steady state?
Variations around a normal that require energy to maintain
Water makes up ______ of the human body.
2 / 3rds
How does homeostasis use water?
Homeostasis uses water and its dissolved substances to create a steady state.
Body fluids can be divided into what two categories?
Intracellular Fluid (ICF) and Extracellular Fluid (ECF)
Extracellular fluid is the fluid _______ the cell.
25% of the ECF in the fluid protion of the _______ known as _______.
75% of the ECF lies around/between the cells known as _________ _______.
ECF = ________ + ________
Plasma + Interstitial fluid
The movement of a solute from an area of greater solute concentration to an area of lower solute concentration.
The difference in solute concentrations is known as the ___________ _________.
The movement of water down the concentration gradient across a semi permeable membrane
Active transport requires _____, ______ , and _______ for molecules to be moved into the cell.
2. biological activity
3. expenditure of metabolic energy by the cell
Water and small uncharged molecules move across a cell membrane through ______ _______.
Large molecules (glucose) and Ions (Na+, HCO3-) move across a cell membrane through ______ _______.
What is facilitated diffusion?
The use of protein transporter to move a solute across a membranewithout expending energy
What is an example of a molecule that uses facilitated diffusion?
Active transport move ___ the concentration gradient.
Describe endocytosis (THINK: Packaging)
A section of the plasma membrane enfolds a substance out side the cell, folds across the membrane, separates from the membrane forming a vesicle that moves inside the cell - (EX: Nutrients)
Secretion of material from inside the cell using vesicles at the cell surface
The cell membrane is made up of a ________.
A cell's phospholipid bilayer is also known as _________.
A cell membrane is ________ permeable.
What things do cells need to bring in?
Food (Glucose), O2, Water, Nutrients, Messages
What things do cells need to send out?
Trash (CO2), Goods (Hormones, carrier proteins)
What things do cells need to keep in?