part 3

Question 1

what do you mean by excitable neurons

Answer 1

neurons are excitable cells because their membranes are in a polarized state

Question 2

what do you mean by resting potential

Answer 2

when the axon is at rest the inside of the axon is negative( k+ ion) and the outside is positive(Na+). Resting potential of a membrane is -70mV

Question 3

Depolarization

Answer 3

when the instruction has been reached opening of Na+ gate channels occur and influxation of Na+ takes place now the potential is 0 not -70mV. aka Action potential

Question 4

repolarization

Answer 4

where A needs to back to its original position is known as repolarization

Question 5

what happens during repolarization

Answer 5

now k+ gate channels open up. efflux if K+ take place

Question 6

what is sodium-potassium pump

Answer 6

after repolarization has been achieved sodium-potassium pump works at its resting potential, where the oump gives out 3 Na+ and brings in 2 K+ ions.