Question

What are the stages of human embryonic development?

Answer 1

The stages of human embryonic development include fertilization, cleavage, gastrulation, and organogenesis. During fertilization, the sperm penetrates the egg and creates a zygote. Cleavage occurs as the zygote undergoes rapid cell division, which leads to the formation of a blastocyst during gastrulation. Finally, during organogenesis, the germ layers differentiate and develop into specific organs and structures.

Answer 2

The stages of human embryonic development are:

1. Fertilization - the fusion of a sperm and egg cell to form a zygote.
2. Cleavage - the rapid division of the zygote into a ball of cells called a blastula.
3. Gastrulation - the formation of three germ layers (ectoderm, mesoderm, and endoderm) that will give rise to all the tissues and organs of the body.
4. Neurulation - the formation of the neural tube, which will develop into the brain and spinal cord.
5. Organogenesis - the formation of organs and organ systems, including the heart, lungs, liver, and kidneys.
6. Fetal development - the growth and maturation of the fetus until birth.