PGY 502 Opening Exam Questions With 100%
Verified Answers!!
If Vmem moves from -60 to -75mV the cell has?
Hyperpolarized
If inward current increases, what happens to Vmem?
Depolarization
Draw depolarization, overshoot, repolarization, and hyperpolarization
How does the membrane potential increase from rest?
Change in the permeability of ions with Erev>rest
Why doesn't the membrane potential depend on change in ion concentration gradients
Changes in ion permeability change Vmemb
What type of current injection causes depolarization?
Inward current
Membranes are what kind of circuits
Resistance/Capacitance
Resistance is
1/g (g=conductance)
Action Potential
All or nothing event, occurs when threshold membrane potential is reached
What is threshold
Point at which a runaway positive feedforward cycle of Na+ channel activation is triggered,
causing even more depolaization
Verified Answers!!
If Vmem moves from -60 to -75mV the cell has?
Hyperpolarized
If inward current increases, what happens to Vmem?
Depolarization
Draw depolarization, overshoot, repolarization, and hyperpolarization
How does the membrane potential increase from rest?
Change in the permeability of ions with Erev>rest
Why doesn't the membrane potential depend on change in ion concentration gradients
Changes in ion permeability change Vmemb
What type of current injection causes depolarization?
Inward current
Membranes are what kind of circuits
Resistance/Capacitance
Resistance is
1/g (g=conductance)
Action Potential
All or nothing event, occurs when threshold membrane potential is reached
What is threshold
Point at which a runaway positive feedforward cycle of Na+ channel activation is triggered,
causing even more depolaization
