Homeostasis Flashcards
why does phased seperation occur
contact is minimised between polar and non-polar components by grouping polar together so they can have as many polar interactions as possible
why does phased separation occur
contact is minimised between polar and non-polar components by grouping polar together so they can have as many polar interactions as possible
what is added to the phospholipid bilayer to prevent it freezing at body temperature
cholesterol
which kind of molecules cannot cross the lipid bilayer
hydrophilic
examples of what can pass through the phospholipid bilayer
CO2, steroids (testosterone), some drugs
4 types of diffusion transport
direct free diffusion
uniporter
co-transporter
antiporter
where are high sodium levels found? where are high potassium levels found?
sodium - outside cell
potassium - inside cell
what does the Na+/K+ ATPase do
3Na+ out, 2K+ in
example on how the NA+/K+ ATPase can be used
lower concentrations of Na+ in cell cause it to diffuse in through other receptors, providing energy for eg glucose to enter with it
4 classifications of paths?
autocrine
juxtacrine
paracrine
endocrine
autocrine?
signalling to itself
signalling in general to another cell
paracrine
juxtacrine
signalling to an immediate neighbour
endcrine?
passing via blood to otherc ells
are steroids hydrophobic or hydrophilic
hydrophobic