Cellular Transportation Maintaining Equilibrium Cellular Transport Passive Transport

Cellular Transportation Maintaining Equilibrium

Cellular Transport Passive Transport § Movement of particles across the cell membrane without using energy Three Modes of Passive Transport § Diffusion § Facilitated Diffusion § Osmosis

Cellular Transport Diffusion § Movement of particles from an area of high concentration to an area of lower concentration Initial Conditions Diffusion Low High Low

Cellular Structure and Function Cellular Transport § Diffusion is controlled by § Temperature § Pressure § Concentration Dynamic Equilibrium § Reached when diffusion of material into the cell equals diffusion of material out of the cell § Molecules continue to move, but the overall concentration remains the same.

Cellular Structure and Function Cellular Transport Diffusion in a Cell

Cellular Structure and Function Cellular Transport Facilitated Diffusion § Movement of materials across the plasma membrane using proteins Channel Proteins Carrier Proteins

Cellular Structure and Function Cellular Transport Osmosis § Diffusion of water across a selectively permeable membrane Three Types of Solutions § Isotonic § Hypertonic

Passive Transport

Cellular Structure and Function

Cellular Structure and Function Cellular Transport Isotonic Solution § Water and dissolved substances diffuse into and out of the cell at the same rate. Plant Cell Blood Cell 11, 397 x

Cellular Structure and Function Cellular Transport Hypotonic Solution § Solute concentration is higher inside the cell. § Water diffuses into the cell. § The cell swells and may burst! Plant Cell Blood Cell 13, 000 x

Cellular Structure and Function Cellular Transport Hypertonic Solution § Solute concentration is higher outside the cell. § Water diffuses out of the cell. § The cell will shrink! Plant Cell Blood Cell 13, 000 x

Cellular Structure and Function Cellular Transport Active Transport § Movement of particles across the cell membrane using energy § The protein or membrane changes shape=energy used Active Transport Using Carrier Proteins

Cellular Structure and Function Cellular Transport Types of Active Transport Pumps § Na+/K+ ATP pump § Moves three Na+ ions out of the cell and two K+ ions into the cell

Cellular Structure and Function Cellular Transport Endocytosis § Process by which the cell surrounds and takes particles into the cell § “Cell Eating” Exocytosis § Secretion of material out of the plasma membrane § “Cell Pooping”

Active Transport

n http: //www. youtube. com/watch? v=d. PKv. Hr. D 1 e. S 4 n Cellular transport video