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plasma membrane (chemical signalling between cells (endocrine signals,…
plasma membrane
chemical signalling between cells
endocrine signals
autocrine - to your own self
paracrine - to cells around u
synaptic
contact-dependent
Components (CPCP)
cholestrol
phospholipids
carbohydrates
proteins
membrane proteins function
acts as an enzyme
transporters
structural proteins
mmebrane receptor proteins
plasma membrane function (PECS)*
physical barrier (physical isolation)
exchange of materials with the environment
communication between cell and environment
structural support
membrane transport
selective permeability
diffusion
high concentration to low concentration (OF SOLUTE/ION/PARTICULAR THIGN)
facilitated diffution
similar but requires a carrier
osmosis
diffusion of water molecules across plasma membrane down concetnraiton gradient
water always travels from hypotonic to hypertonic environment
Phospholipid molecule
Polar Head - hydrophilic tail bury themselves in water
2 nonpolar fatty acid tails - hydrphobic