Flashcards in Transport Across The Plasma Membrane Deck (12):
Define Term: Passive movement across plasma membrane
Passive processes do not require the use of energy (ATP)
Define Term: active transport across cell membrane
Active processes use the energy contained in ATP.
Define Term: solvent
Dissolving medium. I.e. Water
Define Term: Solute
Solutes are the substances dissolved in the solvent
Define Term: Solution
A solution consists of solutes dissolved in a solvent.
Define Term: Concentration Gradient
A concentration gradient is said to exist if the concentration of a particular solute is higher on one side of the plasma membrane and lower on the other side of the plasma membrane.
Define Term: Hypotonic
A hypotonic solution has a relatively low solute concentration (low in relation to x)
Define Term: Hypertonic
A hypertonic solution has a relatively high solute concentration (high compared to x)
Define Term: Isotonic
Two solutions are said to be isotonic when they have an equal concentration of solutes.
Define term: Osmosis
Osmosis is the movement of water molecules by diffusion across a semi-permeable membrane. During osmosis, water moves from a hypotonic solution to a hypertonic solution until equilibrium is reached.
Define term: crenate
Become shoveled with spiked edges. When blood cells are put in a hypertonic solution and the water leaves the cell.