Question

The developing cells are called a fetus from the:

1) Time the fetal heart is heard
2) Eighth week to the time of birth
3) Implantation of the fertilized ovum
4) End of the second week to the onset of labor

Answer 1

A developing human is called a fetus from the ninth week of gestation until birth, which means from the end of the eighth week following fertilization until delivery.

Step-by-step explanation:

Developing cells are called a fetus from the ninth week of gestation until the time of birth. The period from weeks 3 to 8 after fertilization is known as the embryonic stage, wherein the developing human is referred to as an embryo. During the embryonic stage, the heart begins to beat, and organs start to form and become rudimentary.

After the embryonic stage, specifically from the end of the eighth week until birth, the developing organism is called a fetus. This fetal stage is marked by continued cell growth, differentiation, and the full development of organ systems that were initiated during the embryonic period. Based on this information, the correct answer to the question is option 2: 'From the eighth week to the time of birth'.