Once Diffusion from the Endometrium Becomes Inadequate for Delivery of Oxygen

question 12

Multiple Choice

Once diffusion from the endometrium becomes inadequate for delivery of oxygen, the placenta develops from projections of the______, which facilitates exchange of nutrients and waste by the______

• A) amnionic villi into the endometrium : short distance between maternal and fetal blood
• B) chorionic villi into the embryo : mixing of maternal and fetal blood
• C) chorionic villi into the endometrium : short distance between maternal and fetal blood
• D) chorionic villi into the endometrium : mixing of maternal and fetal blood
• E) chorionic villi into the embryo : short distance between maternal and fetal blood

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Definitions:

ERPs

Event-Related Potentials, which are measured brain responses that are the direct result of a specific sensory, cognitive, or motor event.

Stimuli

External or internal factors that elicit a response from a biological organism, which can be sensory, such as light and sound, or psychological, such as events or conditions that provoke reactions.

Endorphins

Natural chemicals produced by the body that interact with opiate receptors in the brain to reduce pain and boost feelings of pleasure or euphoria.

Evolutionary Advantage

A characteristic that enhances the survival or reproduction of organisms that possess it, relative to those that do not.