If an Optic Nerve of a Mature Frog Is Transected

question 47

Multiple Choice

If an optic nerve of a mature frog is transected and half of the associated retina is destroyed,

• A) the axons grow out from the retinal ganglion cells in the remaining half of the retina to their original targets on the optic tectum.
• B) the destroyed retina regenerates and then axons grow out from the complete retina and innervate the optic tectum in the species-typical fashion.
• C) the axons grow out from the remaining retinal ganglion cells to targets systematically distributed over the entire optic tectum.
• D) half of the optic tectum degenerates.
• E) both A and D

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Definitions:

Red Blood Cells

Cells in the blood responsible for carrying oxygen from the lungs to the rest of the body and returning carbon dioxide to be exhaled.

Rouleaux Pattern

A condition where red blood cells stack up in a row, resembling a stack of coins, often observed in various blood disorders.

B Lymphocytes

White blood cells that form part of the immune system and are involved in the production of antibodies to combat infections.

Humoral Immunity

The aspect of immunity that is mediated by antibodies produced by B cells in response to external pathogens.