[Dropdown 1] Open in Response to Changes in Membrane Potential

Short Answer

[dropdown 1] open in response to changes in membrane potential and are located in axolemma of all types of neurons.[dropdown 2] are only located in the membrane of synaptic end bulbs.
Dropdown 1 choices:
Leak channel
Ligand-gated channels
Mechanically gated channels
Voltage-gated channels
Dropdown 2 choices:
Voltage-gated calcium channels
Voltage-gated chloride channels
Voltage-gated potassium channels
Voltage-gated sodium channels