What is the blastula stage?

Question

OMG!! GUYZ im studying for my biology test and im so lost. Please please help me and answer the questions I need to know. Thanks a lot !!!!!!

Answer 1

The blastula is an early stage of embryonic development in animals. It is also called blastosphere. It is produced by cleavage of a fertilized ovum and consists of a spherical layer of around 128 cells surrounding a central fluid-filled cavity called the blastocoel. The blastula follows the morula and precedes the gastrula in the developmental sequence. A whitefish blastula is often used to help study the processes of mitosis in animal cells. The blastula is prevented from multiplying during the nuclear-injection stage.

In mammals, blastulation leads to the formation of the blastocyst, which must not be confused with the blastula; even though they are similar in structure, their cells have different fates. The blastocyst consists of two primary cell lines: the inner cell mass, also known as the epiblast, and the trophoblast. The former is the source of embryonic stem cells and gives rise to all later structures of the adult organism. The latter combines with the maternal endometrium to form the placenta in eutherian mammals.

Answer 2

As I recall, the blastula stage of fetal development is the extremely early stage where the fetus is comprised of an aggregate of cells that have not yet differentiated into various structural elements (eyes, hands, etc). A blastula is pretty much just a ball of cells that hasn't developed into more complexity yet.

Answer 3

The blastula is part of the development of a zygote. Basically it is a fluid filled ball of cells. In mammals, this blastula is what implants into the lining of the uterus.

Answer 4

At the Squires Strip Joint in Revere that is the back stage near the kitchen.

It was named after that really early embryo stage