ACTIVE TRANSPORT

Mr. Cistaro 11/11/12

MOLECULAR MEMBRANE

ACTIVE TRANSPORT – SWIMMING AGAINST THE CURRENT Active Transport requires energy.

Molecular TransportEndocytosis

Phagocytosis Pinocytosis

Exocytosis WORD CHECK.

Endo / Exo ??? / ???Cytosis ???

MOLECULAR TRANSPORT Cells use E (ATP) to pump ions/compounds

against the concentration gradient (from low concentration to high concentration).

EXAMPLESodium-Potassium Pump It moves sodium ions

out of cells while moving potassium ions in.Pumps out 3 sodiums for every 2 potassiums it

pumps in. It occurs in animals. It has a particular significance for excitable cells

such as nerve cells, which depend on this pump for responding to stimuli and transmitting impulses.

MOLECULAR TRANSPORT Na+/K+Pump

MOLECULAR TRANSPORT

ENDOCYTOSIS The movement of bulk materials into

cells. Phagocytosis - The movement of solids.Pinocytosis - The movement of liquids.

ENDOCYTOSIS - PHAGOCYTOSIS Phagocytosis (from Ancient Greek

φαγεῖν (phagein) , meaning "to devour", κύτος, (kytos) , meaning "cell", and -osis, meaning "process") is the cellular process of engulfing solid particles by the cell membrane.

ENDOCYTOSIS - PHAGOCYTOSIS Scanning electron micrograph of a

phagocyte (yellow, right) phagocytosing anthrax bacilli (orange, left)

ENDOCYTOSIS - PINOCYTOSIS Pinocytosis is the process in which small

particles are brought into the cell, forming a vesicle, and fuse with lysosomes to break down the particles.

ENDOCYTOSIS - PINOCYTOSIS The difference between Phago and

Pinocytosis?

ENDOCYTOSIS - PINOCYTOSIS The difference between Phago and

Pinocytosis?

EXOCYTOSIS The movement of bulk materials out of

cells.From Greek ἔξω "out" and

κύτος "receptacle“ / "cell"Example: secretion of enzymes

WEIRD WORDS & QUESTIONS ??? Quiz next week.