For Over a Minute,Laura Has Been Staring at an Image

question 251

Multiple Choice

For over a minute,Laura has been staring at an image with seemingly random areas of white-on-black.When she shifts her gaze from the original image to a white wall,she suddenly sees an image of Jesus on the wall.Which of the following explains this phenomenon?

• A) Photoreceptors in the retina have become fatigued.
• B) Photoreceptors in the lateral geniculate nucleus have become fatigued.
• C) negative afterimage
• D) positive afterimage

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Definitions:

Placenta

An organ that develops in the uterus during pregnancy, providing oxygen and nutrients to, and removing waste from, the fetus.

Trophoblast

A layer of cells surrounding the blastocyst in early development that provides nutrients to the embryo and develops into part of the placenta.

Inner Cell Mass

The inner cell mass is a group of cells inside the primordial embryo that will eventually develop into the fetus.

Germ Layers

The three primary layers of cells (ectoderm, mesoderm, and endoderm) in an embryo that develop into all organs and tissues of the body.