Embryonic stage Flashcards
1
Q
What is cleavage?
A
A period of mitosis
2
Q
Period of cleavage
A
30 hrs after zygote is formed cleavage begins
Cells divide rapidly becoming smaller each division as the zygote moves down the uterine tube
3
Q
Zygote in the uterus
A
It takes 3 days for the zygote to get to the uterus
Mass has developed into a solid ball of 16 cells called a morula
4
Q
Period of morula
A
Stays in the uterine cavity for 3 days unattached
Forms hollow mass called a blastocyst
5
Q
Period of blastocyst
A
Implants into the endometrium of uterus by end of first week
6
Q
What type of cell is it up to this point?
A
Pluripotent stem cells-rise to more stem cells and several types of specialised cells
