Cell Permeability and Transport

Know all, but emphasize on Diffusion, osmosis, active transport, filtration and identify hypertonc, hypotonc, and isotonic conditions.

Filtration

Particles are driven through membrane by physical pressure; delivery of water nutrients to tissues & removal of waste from collaries in kidneys

Difusion

Net movment of partices from place of high concentration toplace of lower conentration; gas exchange in lungs, nutrient absorption in the digestive system

Osmosis

Net flow of water through a selectively permeable membrane; gas exchange in lungs, nutrient absorption in the digestive system

Facilitated diffusion

Carrier moves solute down in concentration gradient; no ATP consumption

Facilitated diffusion

Transport of glucose and amino acids into cells, water cells (aquaporins)

Primary active transport

Carrier moves solute through a membrane up its concentration gradient ; ATP consumption

Secondary active transport

Carrier moves solute through membrane, but only uses ATP indirectly; Na-glucose transported

Hypertonic

if its solute concentration is higher than that inside the cell, and the solutes cannot cross the membrane; solutions with a high osmotic pressure.

Hypotonic

If the solute concentration outside the cell is lower than inside the cell, and the solutes cannot cross the membrane; solutions having a lower osmotic pressure

Isotonic

there is no net water movement, so there is no change in the size of the cell; solutions having equal osmotic pressures