At an Excitatory Chemical Synapse Between Two Neurons

question 43

Multiple Choice

At an excitatory chemical synapse between two neurons

• A)there is increased permeability of the postsynaptic cell to both Na⁺ and K⁺.
• B)a small hyperpolarization of the postsynaptic membrane occurs when the synapse is activated.
• C)an action potential in the presynaptic neuron always causes an action potential in the postsynaptic neuron.
• D)excitation occurs because K⁺ enters the postsynaptic cell.
• E)action potentials spread through gap junctions between cells.

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Definitions:

Parvo Cells

Ganglion cells that, because of their sensitivity to differences in hue, are particularly suited to perceiving color and form.

Hue

Hue refers to the distinct characteristic of color perceived by the eye, fundamentally describing colors such as red, blue, green, etc., based on their wavelength in the visible spectrum.

Visual Agnosia

The inability to recognize a visual stimulus despite the ability to see and describe it.

Magno Cells

A type of neuron in the visual system, sensitive to motion and dynamic changes in the environment, associated with peripheral vision.