If a Woman Does Not Know She Is Pregnant,and Undergoes

question 70

Multiple Choice

If a woman does not know she is pregnant,and undergoes a diagnostic medical procedure involving exposure of her abdomen to radiation,the developing baby may be at risk.Why would the risk of birth defects be highest if the woman received the radiation during weeks 2-8 of her pregnancy?

• A)Organs first begin to develop during the pre-embryonic stage
• B)Organs first begin to develop during the embryonic stage
• C)Organs first begin to develop during the fetal stage
• D)Organs first begin to develop during the zygotic stage
• E)Organs first begin to develop during the morula stage

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Definitions:

Proteins

Large molecules essential for the structure, function, and regulation of the body's tissues and organs, made up of amino acids.

Nucleus

The central part of an atom containing protons and neutrons, or a membrane-enclosed organelle found in eukaryotic cells that contains the genetic material.

Chromosomes

Thread-like structures located inside the nucleus of animal and plant cells, made of protein and a single molecule of deoxyribonucleic acid (DNA).

Cell

The smallest structural and functional unit of an organism, typically microscopic and consisting of cytoplasm and a nucleus enclosed in a membrane.