Rh-Negative Mothers Who Are in Their Second or Subsequent Pregnancy

question 11

Multiple Choice

Rh-negative mothers who are in their second or subsequent pregnancy will often receive this treatment to prevent hemolytic disease of the newborn?

• A) An Rh immune globulin, or antiserum directed against Rh-positive antibodies, is administered during pregnancy and within 72 hours of delivery.
• B) An Rh immune globulin, or antiserum directed against Rh-negative antibodies, is administered during pregnancy and within 72 hours of delivery.
• C) A series of graded injections of Rh-positive antigen is administered during pregnancy to switch anti-Rh IgG (which crosses the placenta) to anti-Rh IgM (which cannot cross the placenta).
• D) A series of graded injections of Rh-negative antigen is administered during pregnancy to switch anti-Rh IgG (which crosses the placenta) to anti-Rh IgM (which cannot cross the placenta).

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Definitions:

Figure-Ground Perception

The ability to distinguish an object (the figure) from its surroundings (the ground).

Visual Afterimage

An optical illusion where an image continues to appear in one's vision after the exposure to the original image has ended.

Retinal Disparity

The slight difference in visual perception that comes from the images projected on the retinae of the eyes, which is a cue to depth perception.

Depth Perception

The ability to perceive the world in three dimensions and judge the distance of an object.