Define the first trimester.

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Prepare for the CIEMT Medical and Physiology Exam. Study with flashcards and multiple-choice questions that feature explanations. Ace your test!

Multiple Choice

Define the first trimester.

Explanation:
The first trimester spans the earliest phase of pregnancy, typically defined as weeks 1 through 12 of pregnancy (gestational age counted from the first day of the last menstrual period). During these weeks, foundations for all major organs form, and rapid development occurs. By the end of this period, the embryo has developed into a recognizable fetus, and early screening often begins. The other timeframes correspond to the second and third trimesters (or extend beyond term), so they do not define the first trimester.

The first trimester spans the earliest phase of pregnancy, typically defined as weeks 1 through 12 of pregnancy (gestational age counted from the first day of the last menstrual period). During these weeks, foundations for all major organs form, and rapid development occurs. By the end of this period, the embryo has developed into a recognizable fetus, and early screening often begins. The other timeframes correspond to the second and third trimesters (or extend beyond term), so they do not define the first trimester.

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