Quiz 3 Flashcards
metabolize
use nutrients to build new cell material, break down substances, and make ATP
solution
a homogeneous mixture of two or more compounds
solvent
present in the largest amount in a solution
solute
present in smaller amounts
intracellular fluid
a solution containing small amounts of gases, nutrients, and salts, dissolved in water
interstitial fluid
the fluid that continuously bathes the exterior of our cells
selective permeability
a barrier allows some substances to pass through it while excluding others
passive transport processes
substances transported across the membrane without any energy input from the cell
active transport processes
the cell provides the metabolic energy (ATP) that drives the transport process
diffusion
- process where molecules spread themselves throughout available space; due to kinetic energy
- move down a concentration gradient
- affected by size of molecule and temp
plasma membrane
a physical barrier to diffusion where molecules will move passively by diffusion of 1) they r small enough to pass through its pores 2) they can dissolve in the fatty portion of the membrane
simple diffusion
unassisted diffusion of solutes through the plasma membrane
osmosis
simple diffusion of water
facilitated diffusion
process driven by concentration gradient, but molecules are too big and are lipid insoluble; needs a protein carrier to help
(ex: glucose)
filtration
-process where water and solutes are forced through a membrane by hydrostatic pressure exerted by blood
-uses high to low pressure gradient
~happens in kidney solutes from capillaries to kidney tubules
active transport
using energy to move molecules through the plasma membrane bc they are too large, cant dissolve in hydrophobic area, or move against the gradient
