Exam 1 Flashcards
Does excitation of the rod cell by blue light produce an action potential in the connected bipolar cell?
No
What process produces the most ATP molecules per glucose molecule?
Oxidative phosphorylation
What does stimulation of a hair cell result in?
Opening of voltage gated Ca2+ channels
What does complete destruction of the left lateral geniculate nucleus result in?
None of the above
Why are we physiologically able to differentiate amoung different pitches?
Hair cells at different locations on the basilar membrane respond to different frequencies
What is saltatory conduction of an action potential?
none of the above
A and B neurons synapse into a neuron C. A-C is chemical excitatory and B-C is electrical. What statement is correct?
A depolarization in C causes a depolarization in B
The detection of light in the eye is based on the light-induced change of what?
Cis retinal to trans retinal
What is the correct sequence of events during an action potential?
Membrane depolarization
Activation of voltage gated Na channels
Deactivation of Na channels and activation of voltage gated K channels
Deactivation of k-channels and repolarization
membrane hyperpolarization
What will happen to the conduction velocity of action potentials if only resistance across the axon membrane increases?
Increase
How does the reversal potential differ from the action potential?
The reversal potential does not involve the Hodgkins cycle and is sue to opening of postsynaptic ion channels allowing both Na+ and K+ to go through
What is true for the muscarinic ACh receptor?
Opening the channels leads to a hyperpolarization
What cell has the slowest conduction speed?
Unmyelinated neuron with smallest diameter
What would happen if a neuron was experimentally stimulated at both ends?
The AP would stop in the middle
What does lateral inhibition result in?
Increase in stimulus contrast
