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:

Epididymis

A long, coiled tube located behind the testis where sperm mature and are stored.

Seminal Vesicles

Glands in the male reproductive system that produce a significant portion of the fluid that becomes semen.

Vas Deferens

The duct that conveys sperm from the testicle to the urethra, playing a key role in the male reproductive system.

Human Chorionic Gonadotropin

A hormone produced during pregnancy by the developing embryo and the placenta to support fetal growth.