Quiz 2 Flashcards
Which structure or substance provides the most focal power in the eye?
cornea
When working correctly, the cornea and lens will focus light on to the back of the retina. When the cornea or lens causes the focal point to be beyond the retina, this is called __________
hyperopia (farsightedness)
EYE ANATOMY
More Eye Anatomy
which strucuture is most damaged by glaucoma?
optic nerve
When a photon of light causes the retinal molecule on an opsin strand to change shape and
eventually break off, this specific process is called __________.
isomerization
An elderly woman find that she needs to hold the newspaper farther and farther away to be able to
read it. This indicates that her near point is increasing and she most likely has:
Presbyopia
After 3 to 4 minutes in the dark, which receptors would (generally) be most adapted?
Cones
The foveal portion of the retina contains only cones – about 50,000 -110,000 of them. These
provide great detail on items in the central focus of vision. ___________ is a condition in which
primarily the fovea and immediately surrounding region are damaged, causing a loss of sight in
this area.
Macular degeneration
What can cause the iris in the right eye to constrict?
When signals come in from each sensory organ, they are thought to first go to their own ‘primary’
sensory area in the cortex. This is the concept of sensory modularity. What is the primary sensory
area in cortex for auditory signals?
Temporal lobe
An action potential is typically triggered when:
EPSPs push a neuron to depolarization faster than the IPSPs to hyperpolarization.
When multiple axons synapse on a single neuron, this is called __________.
convergence
When attempting to record the propagation of an action potential, the recording electrode should
be placed inside the __________, while the reference electrode is placed __________.
axon, outside the cell
In the absence of any incoming signals from receptors or other neurons, is the baseline
firing rate of a neuron ever 0 spikes per second?
NO!!!
