Action Potential Dr. Jones Neuro Exam 1

How do we cause the rapid changes to a depolarizing level and how does it return back to rest?

• Not making any changes or alterations to the permeability of ions

• Changing the permeability of ions on the membrane

Which of the following helps with the achievement of the grades potentials in the threshold?

• Aminoacidic

  binding to an ion channel receptor

• ligand receptor (Neurotransmitters) binding to an ion channel receptor

Where are action potentials fired to actually start an action potential?

• dendrites

• soma

• trigger zone

• cell body

Activation of which of the following will most often cause IPSPs ?

• ligand gated Cl^- channels

• ligand gated Na+ channels

• ligand gated Ca++ channels

Which of the following cause the rapid upstroke of an action potential?

• Voltage-gated sodium channels

• Voltage-gated potassium channels

• Voltage-gated calcium channels

• Voltage-gated chloride channels

Which of the following will be closed when the inside of the cell is negative?

• h-gate

• m-gate

Which of the following is TREU regarding voltage gated channels?

• Depolarizing signal makes the membrane more negative forcing the m-gate to close allowing Na+ to come into the cell.

• Depolarizing signal makes the membrane more positive forcing the m-gate to open allowing Na+ to come into the cell.

• Depolarizing signal makes the membrane more positive forcing the h-gate to open allowing Ca+ to come into the cell.

• Depolarizing signal makes the membrane more positive forcing the h-gate to open allowing Na+ to come into the cell.

Which of the following causes the h-gate (inactivation gate) to block the pore so Na+ CANNOT come in anymore?

• too much positive charges

• too much negative charges

• too little positive charges

• no charges

Which of the following ensures depolarization of the membrane?

• positive feedback

• negative feedback

Which of the following leaves the cell causing repolarization ?

• voltage gated Na+ channels

• voltage gated K+ channels