The Umbilical Cord

question 140

Multiple Choice

The umbilical cord:

• A) connects the embryo or fetus to the placenta.
• B) carries the mother's blood to the embryo or fetus.
• C) is formed from the layer of cells called the endoderm.
• D) protects the embryo or fetus from being knocked about as the mother moves.

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Definitions:

Wavelengths

The distance between consecutive points of the same phase in a wave, such as in sound waves, light waves, or other electromagnetic radiation.

Cones

Photoreceptor cells in the retina of the eye that function best in relatively bright light and provide the ability to see color and fine detail.

Colorblind

The inability or decreased ability to see color, or perceive color differences, under normal lighting conditions.

Blind Spot

The area in the field of vision that lacks light-detecting photoreceptor cells due to the location where the optic nerve exits the eye, resulting in a lack of visual perception in this zone.