3- Neuronal Membrane Flashcards
5 main aspects of the neuronal membrane
Phospholipid membrane
Proteins
Membrane potential
Equilibrium potentials
Resting membrane potentials
What does the phospholipid membrane do?
Protects cell contents, and allows exchange of contents between outside and inside of cell
What is the phospholipid bilayer?
Hydrophilic phosphate heads face outwards and hydrophobic fatty acid tails face inwards
Why are proteins important?
Receptors and pores create a passage between interior and exterior of the cell
What do proteins contain?
Ion channels and highly specific structures
What is the membrane potential?
Voltage across membrane
What is the resting potential of a membrane?
-65 mV
Membrane is electrically negative
Which side of the membrane is more negative?
Inside
Why are there many different ions inside and outside cell?
They all have a different equilibrium potential that add up
How does the sodium-potassium pump exchange ions?
Exchanges 3 internal sodium ions out and 2 external potassium ions in against a concentration gradient
Why is mitochondria producing ATP important for the sodium-potassium pump?
Produces energy for it
What does equilibrium mean?
Same concentration of ions on both sides of membrane
What is ion concentration like in resting membrane potential?
Potassium concentration kept higher inside, sodium concentration kept higher outside
