Lecture Notes - Transport Through Membrane

Transport Through Membrane Many kinds of organelle or things life cell Which there is in in cytoplasm own membrane Which its structure The same with structure membrane plasma. Membranes the always passed by many kinds of material molecule results something process metabolism cell nor the rest. There are various ways to transfer molecule between other with method diffusion, osmosis, or transport active. Method diffusion And method osmosis No need energy, currently- right method transport active need energy. Sometimes something particle No can diffuse Because hindered by membrane Which impermeable (No can penetrated). However, If on membrane That there is factor helpers, for example enzymes cause it opened channel. on proteins integral, particle the can diffuse without involve energy, incident This called diffusion helped or facilities. Part particle transported traverse membrane with method transport active, that is with involve a number energy For transfer particle from solution Which his concentration more low (hypotonic). Transport active Also done If membrane own level permeability Which very low to particle certain. 1. Diffusion particle s (b) particle sl mix ) Inside the cell, substances that own heavy molecule low candiffuse through membrane. During This diffusion process of dissolved substances can move from solution high concentration into solution concentrate low. Displacement substance This Keep going happen so that achieved circumstances balanced, on moment circumstances balanced concentration second solution The same big. 2. Osmosis Membrane cell limit fill cell with environment surroundings, However thereby various substance dissolved must can go out enter cell For carry out metabolism cell. Process osmosis is displacement solvent something substance through membrane selective permeable. Selective permeable It means No all molecule can through membrane the. Only molecules certain Which freely go out enter membrane the. 3. Transport Active Sometimes something particle No can diffuse Because hindered by membrane Which impermeable (No can penetrated). However, If on membrane That there is factor servant, for example enzyme Which cause it opened channel on proteins integral, particle the can diffuse without involve energy. Incident This called diffusion helped/facilitated. Part particle transported traverse membrane with method transport active, that is with involve a number energy For transfer particle from solution Which his concentration more low (hypotonic). Transport active Also done If membrane own level permeability Which very low to particle certain. There is two form endocytosis, that is phagocytosis And pinocytosis . Phagocytosis originate from say fago, It means Eat Because show as if cell currently Eat. Pinocytosis comes from the word pinos, meaning to drink as if show cell currently drink. Phagocytosis And pinocytosis is method other so that something substance can go out enter cell without penetrate membrane plasma. On process phagocytosis happen bulge cytoplasm Which called pseudopodia envelop something substance congested in outside cell. On something substance the will formed membrane Which regardless from membrane plasma form something pocket, called phagocytic vacuole. Different with phagocytosis, on process pinocytosis No formed bulge protoplasm, but fluid as if interested by membrane, Then membrane do invagination (curved to lower). Furthermore regardless from membrane cell so that formed One vacuole. Substance Which involved in process pinocytosis usually form substance liquid. Incident phagocytosis, for example happen on cell blood white to bacteria or destruction of old erythrocytes in the liver, spleen, and red marrow by cells reticuloendothelial. Pinocytosis generally happen on cell leukocytes, cell kidney, epithelium intestines, macrophages heart, And cell root plant. On exocytosis similar with endocytosis but opposite direction. Exocytosis happen if vacuole in in cytoplasm fuse with membrane plasma, Then its contents issued to fluid extracellular. A number of results metabolism like sour amino or glucose will traverse membrane, enter to in cytosol. If there is remains other Which No can digested so will issued from cell through process exocytosis.