What is the first organ to develop in the embryo?
There are three distinct stages of development after fertilization: germinal, embryonic, and fetal development. The major organs are all formed during the embryonic stage of development.
Answer and Explanation:
The first organ to develop in the embryo is the heart. This happens very early in gestation (in humans, around the fifth week), and spurs all other organ development. A heartbeat is one of the first measurable characteristics of gestation.
Learn more about this topic:
from Human Growth and Development: Help and ReviewChapter 4 / Lesson 16
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