CVS Practice Test 2026 – The All-In-One Guide to Exam Success!

Question: 1 / 400

When does embryonic heart development begin?

During the second trimester

During the first trimester

Embryonic heart development begins during the first trimester, specifically in the early weeks following fertilization. This period is crucial as it marks the initiation of the heart tube formation, which ultimately leads to the development of the four chambers of the heart. By the end of the first trimester, the heart's anatomy is largely established, and it begins to function to circulate blood throughout the developing embryo. This early development is vital for ensuring that the embryo receives adequate oxygen and nutrients, supporting its growth and development during the critical stages that follow.

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At birth

In the early stages of the third trimester

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