During the formation of an embryo, a hollow sphere of cells with a fluid-filled cavity inside is termed a
A) morula.
B) blastula.
C) blastocoel.
D) gastrula.
E) neurula.

Question

Quizplus · Accepted Answer

A hollow sphere of cells with a fluid-filled cavity inside is called a blastula, which develops from the morula (a solid ball of cells). The blastocoel is the fluid-filled cavity inside the blastula. A gastrula is a later stage of embryonic development where the blastula undergoes gastrulation to form the three germ layers. A neurula is an even later stage where the neural tube has formed.

During the Formation of an Embryo, a Hollow Sphere of Cells