Question

BIO 474 PSQ 3, 4, 5

3) Why or how might the control of cell membrane permeability (specifically voltage-dependent and ligand-gated conductances) be important in neuron or brain functioning?

4) From an evolutionary (and practical) standpoint, why don't all of the cells in our bodies have properties similar or identical to nerve cells?

5) [ Think up a question of your own and answer it ] - I DID THIS ONE ALREADY JUST NEED HELP WITH 3 AND 4. Thank you!

Answer 1

Cell membrane permeability control allow the neurons to maintains it's potential gradient ( due to high concentration of negative ions inside the cell there exist a negative potential gradient i.e resting membrane potential of -70mV ) and when voltage gated and ligand gated ion channels open up it leads to action potential to carry the signal so , to regulate the neurotransmitter release , control of cell permeability is essential .

4. Beacuse we are multicellular organisms and we have division of labour among cells . Different organ systems exist in our body to perform desired functions . Different organs have different types of cells . Nervous system has neurons , excretory system has nephrons that has filtration property , cardiovascular system has Cardiomyocytes that has high rhythmicity.so to perform different functions cells need special characterstics , this is what makes them different .