Select one: a. Against the concentration gradient d. Down the electrical gradient c. All of the above d. Down the concen

[answerhappygod]

Select one:
a. Against the concentration gradient
d. Down the electrical gradient
c. All of the above
d. Down the concentration gradient
2) In which cell organelle are the Ca2+ ions kept, which then can be released through the Ca-channels?
Select one:
a. Mitochondria
b. Golgi complex
c. Ribosomes
d. Endoplasmic reticulum
3) Myelin membranes in PNS originate from:
Select one:
a. Oligodendrocytes
b. Neurons
c. Schwann cells
d. Microglia