All of them or ....
what question?
The type of active transport which helps muscle cells to contract is called SODIUM POTASSIUM PUMP. In humans, sodium and potassium ions are pumped in opposite direction across the membrane, this builds up an electrical and chemical gradients which drive other transport processes.
No it is not i have to write more that 20 character
verdad
porque si estos tuvieran carga positiva ya no serían electrones
