In the fourth week after conception, a miniscule blood vessel that is the start of the _____ system begins to pulsate.

Question

Quizplus · Accepted Answer

The cardiovascular system begins to form in the fourth week after conception and the pulsation of the miniscule blood vessel is the first sign of its development. This system is responsible for circulation of blood throughout the body. The respiratory system begins to form in the third week, the skeletal system begins to form in the fifth week, and the digestive system begins to form in the sixth week after conception.

In the Fourth Week After Conception, a Miniscule Blood Vessel