Question

In case of pregnancy the heartbeat of embryo starts at

• A. 4${}^{th}$ week
• B. 7${}^{th}$ week
  
• C. 6${}^{th}$ week
  
• D. 5${}^{th}$ week
  

Answer 1

The correct option is D 5${}^{th}$ week

On the 5${}^{th}$ week of pregnancy, a large tube (primitive heart) starts to beat and pump blood in the embryo. At this stage, the embryo has three layers and the heart is formed by mesoderm.

So, the correct answer is option D.