Human Trophoblasts

question 50

Multiple Choice

Human trophoblasts

• A) form the inner cell mass.
• B) form from ectoderm.
• C) are the precursors of the mesoderm.
• D) are of embryonic origin and function in embryo nutrition.
• E) are of maternal origin and function in embryo gas exchange.

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Definitions:

Dark Adaptation

The process by which the eyes increase their sensitivity to low levels of light, improving the ability to see in the dark.

Visual Receptors

Cells located in the retina of the eye that are responsible for converting light into neural signals the brain can interpret.

Cones

Photoreceptor cells in the retina of the eye responsible for color vision and functioning best in relatively bright light.

Dim Light

A level of illumination that is lower than what is considered bright, often creating a subdued or intimate atmosphere.