If an Optic Nerve of a Mature Frog Is Transected

question 119

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 retinal ganglion cells in the remaining half of the retina 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:

FSH Secretion

The release of Follicle Stimulating Hormone, a gonadotropin involved in the regulation of reproductive processes, such as growth of ovarian follicles in women and spermatogenesis in men.

Connective Tissue

Tissue in the body designed to connect, support, or isolate various organs and tissue types.

Adrenal Cortex

The outer part of the adrenal gland that produces steroid hormones which regulate metabolism, immune response, and salt and water balance.

Water-Soluble Peptides

Molecules composed of short chains of amino acids that are soluble in water, playing various roles in biological processes including signaling and regulation.