The nurse is teaching a prenatal class for mothers with a past history of drug abuse. Which factor ...

Correct Answer: 2
Rationale 1: This is the phase when teratogens have the greatest effect on the embryo.
Rationale 2: In this phase, all the body systems form.
Rationale 3: This is the embryonic period.
Rationale 4: This is the phase when teratogens have the greatest effect on the embryo resulting in possible severe malformations.
Global Rationale: In the first trimester of pregnancy, all the body systems form and this is the time when teratogens have the greatest effect on the embryo and can result in severe malformations. The first trimester is known as the embryonic phase.