Membrane Potential
What has the greatest effect on the resting membrane potential?
K+ concentration
Gaucher's disease involves the accumulation of macromolecules within a cell. What organelle is most likely at fault?
Lysosomes
loss of sensory information from that side
loss of color vision
An otolith is dislodged and floating around in the ear. Where should it return to?
The vestibule
inability to maintain resting membrane potential
Microglia most likely have a lot of which organelle?
lysosomes
Which cellular structure/shape would you expect ependymal cells to be?
Simple cuboidal
What time of day would someone with cone dystrophy be able to see the best?
A physician looks into the external auditory canal. What is the innermost structure that they see?
tympanic membrane
What causes the depolarization phase of an action potential?
reaching threshold from a summation of graded potentials
What is a major protein of the cell junction that facilitates fast and synchronous communication among cells?
connexins
Damage to the cerebellum would cause loss of what motor function?
coordination
ganglion cell-amacrine cell-bipolar cell-horizontal cell-photoreceptor
What is the function of the ossicles?
Amplify vibrations
A toxin blocking K+ channels would have what affect on resting membrane potential?
the potential would become depolarized as K+ permeability decreases.
The cell junction type using occludins and claudins is what?
Why is neuronal impairment a symptom of demyelinating disorders?
There is a decrease in AP transmission velocity, delaying NT release
Which photoreceptor is used in low light situations?
Rods
How does a sound wave travel through the ossicle bones?
malleus-incus-stapes
propagating an action potential
What cell junction uses cadherins?
Adherens junctions
To bypass the blood-brain barrier, a drug should alter what aspect of the barrier?
interrupt tight junctions of astrocytes
Which bipolar cell is activated when there is light present?
On bipolar cells
How do hair cells get depolarized?
Mechanical stimulation