At her first prenatal visit, a woman is discussing fetal development with the nurse. The patient asks, "When will my baby actually have a heartbeat?" The nurse should reply, "The heartbeat of an embryo is distinguishable by:
1. "The fourth week.".
2. "The sixth week.".
3. "The eighth week.".
4. "The twelfth week.".
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Rationale 1: The tubular heart beats at a regular rhythm and pushes its own primitive blood cells through the main blood vessels in the fourth week of fetal development.
Rationale 2: The heartbeat of an embryo is distinguishable before the sixth week of development.
Rationale 3: The heartbeat of an embryo is distinguishable before the eighth week of development.
Rationale 4: The heartbeat of an embryo is distinguishable before the 12th week of development.
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