Transportation Systems

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Diagram containing TYPES OF CELLULAR SYSTEMS. Alberts, B. (2004). Introducción a la biología celular. Madrid: Médica Panamericana.

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ale olva
Created by ale olva about 4 years ago
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Transportation Systems
1 It is the exchange of substances between the cellular inside and the cellular exterior.
1.1 ACTIVE TRANSPORT
1.1.1 Using energy
1.1.2 Masses transportation
1.1.2.1 A solute which goes against the concentration gradient with another solute for its concentration gradient.
1.1.2.1.1 COTRANSPORT
1.1.2.1.1.1 Na+/glucose
1.1.2.1.2 COUNTERTRANSPORT
1.1.2.1.2.1 Na+/Ca+2
1.1.2.2 Carrier proteins that hydrolyze ATP are called "pumps".
1.1.2.2.1 Sodium-potassium pump
1.1.2.2.1.1 It allows maintain concentrations of sodium and potassium in relatively constant intracellular and extracellular medium.
1.2 PASSIVE TRANSPORT
1.2.1 Doesn't require energy
1.2.2 DIFUSSION
1.2.2.1 Facilitated
1.2.2.1.1 The molecules are transported through transmembrane proteins.
1.2.2.1.1.1 CARRIER PROTEINS
1.2.2.1.1.2 TYPE GATE.
1.2.2.1.1.3 SYMPORT
1.2.2.1.1.4 ION CHANNELS
1.2.2.2 Simple
1.2.2.2.1 Direct passage of molecules through the membrane pores.
1.2.2.2.1.1 FOR EXAMPLE:
1.2.2.2.1.1.1 O2, N2, CO2
1.2.2.2.1.2 It ends when concentrations are equalized in both compartments .
1.2.2.2.1.2.1 ISOTONIC: equilibrium
1.2.3 OSMOSIS
1.2.3.1 Water molecules are transported through a membrane , from a zone of lower solute concentration to another of higher concentration.
1.2.3.1.1 The water passes through the membrane by transmembrane proteins.
1.2.3.1.1.1 AQUAPORINS
1.2.3.1.2 The cells may come into contact with solutions of different concentrations
1.2.3.1.2.1 HYPOTONIC
1.2.3.1.2.2 HYPERTONIC