Cellular Transport basics
The movement in and out of cells that influence the internal concentration of molecules.
2 TYPES OF CELLULAR TRANSPORT
Passive and Active
The movement of materials through a cell membrane without using energy. - cell uses no energy, they travel from HIGH to LOW gradient.
Movement across the cell membrane requiring energy (ATP) to be exerted by the cell. Travels from LOW to HIGH gradient.
2 Types: Vesicular Transport and Sodium Potassium Exchange Pump
An active process in which materials move into or out of the cell enclosed as vesicles. Vesicles are bubble-like structures surrounded by a membrane. 2 types endocytosis and exocytosis.
MOVEMENT of DISSOLVED molecules in a fluid or gas from a region of higher concentration to a region of lower concentration. No work is performed for this to happen. diffusion is a spontaneous process
diffusion of WATER molecules across a semipermeable membrane from an area of higher WATER concentration to an area of lower water concentration.
diffusion of molecules ASSISTED by protein channels that pierce a cell membrane. example of a carrier protein is glucose.
process by which a cell surrounds and TAKES IN material from its environment. (cell eating) 3 types: phagocytosis, pinocytosis, & receptor mediated endocytosis.
expulsion or secretion of materials FROM a cell - often used to expel wastes or neurotransmitters.
3 TYPES OF ENDOCYTOSIS
Phagocytosis-the cell engulfing bacteria (WBC'S & Macrophages do this.)
Receptor mediated Endocytosis-cells transported from OUT to IN through receptors (vesicles) located in cell membrane.
SODIUM-POTASSIUM EXCHANGE PUMP
Protein that pumps sodium and potassium across the membrane in either direction working opposite of diffusion, against the concentration gradient.
difference in the concentration of a substance from one location to another
solution that has an EQUAL concentration of dissolved particles compared with another solution.
solution that has a LOWER concentration of dissolved particles compared with another solution
solution that has a HIGHER concentration of dissolved particles compared with another solution.