Transport

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METROPOLIS

Szerző: Cathy Jade

Life on Mars

Szerző: eTwinning 24

BEFORE THE FLOOD

Szerző: Diego Melían López

Epithelial

Szerző: Nina Sawyer

Transport

Active: Uses ATP

Bulk Transport: includes exocytosis and endocytosis

Endocytosis moves substances into the cell by packaging them into vesicles

Pintocytosis: The cell membrane takes in a droplet of extracellular fluid containing dissolved proteins or fats

Exocytosis moves substances out of cells packaging them into vesicles

Phagocytosis: Cytoplasmic extensions engulf large particles such as bacteria or dead body cells

Solute Pumps: Protein carriers that combine reversibly with the solute and use ATP

Examples of this are sodium-potassium pumps. They simultaneously carry sodium ions out and potassium ions into the cell. This is necessary for the transmission of the nerve impulses

Passive: No ATP Needed

Filtration: Process by which water and solutes are forced through a a membrane by fluid pressure

Hydrostatic pressure is usually exerted by blood. A pressure hradient pushes solute-containing fluid from the higher-pressure area to the lower-pressure area. Ex: Kidneys

Diffusion:High to low concentration

Facilitated: Diffusion of substances using a protein membrane channel

Used because the solid is too large or lipid insoluble

Simple:Unassisted diffusion of solutes through the plasma membrane

Osmosis: The diffusion of water through the membrane. Aquaporin makes it easier for water to get through