Question

1. Using a table format and images, describe the key changes that take place in the growing embryo up to eight weeks. (300 words)

Answer 1

a) using a table format and images, describe the key changes that take place in the growing embryo up to eight weeks

1 week	from oocytes spermatozoa fertilization takes place zygote formation enter into morula stage blastocyst formation takes place
2 week	Trophoblast which is outer cell layer formation takes place. Embryoblast which is inner cell mass formation takes place implantation Bilaminar embryo means the generation of two lamina disc takes place.
3 week	Gastrulation where gastrula formed from a blastula. Notochord forms which are cartilaginous skeletal rod support body. Trilaminar embryo formed from the bilaminar embryo. Mesoderm which is a middle layer of cell forms ( bone, muscles formation takes place) Somitogenesis and Neurogenesis take place.
4th week	heart forms and begins to beat arm bud appear liver pancreas and gall bladder forms spleen cell also forms.
5th forms	blood begins to circulate facial features start to develop eyes formation leg buds formation hands appear as paddles
6th week	lung formation takes place finger and toes also form
7th week	hair follicles start forming elbows and toes are visible.
8th week	face and external ears start to form. embryo start looking like a human