Question

The extraembryonic membranes of mammalian embryo are derived from
A) Trophoblast
B) Follicle cells
C) Inner cell mass
D) Formative cells

Answer 1

Hint:Since radioactive pollutant is taken up into bone, the bone itself and nearby soft tissues may be damaged by radiation released over time.

Complete answer:
a. The extraembryonic membranes of the mammalian embryo are derived from trophoblast, after the cleavage of the zygote, the blastocyst is formed. Then, the trophoblast, the epithelial layer surrounding the blastocyst is formed. These trophoblast cells are destined to form most of the extraembryonic membranes in mammals.

b. Follicular cells have long profiles of rough endoplasmic reticulum and an outsized Golgi body in their cytoplasm for the synthesis and packaging of considerable amounts of protein that are transported into the follicular lumen.

c. The inner cell mass (ICM) forms within the blastocyst, before its implantation within the uterus. The ICM may be a cellular mass on one side of the hollow interior of the round embryo, the outer layer of which is named the trophoblast. The ICM is the only pluripotent cell lineage within the blastocyst.

d. Formative cellular division utilizing precise rotations of cell division planes generate and spatially place asymmetric daughters to provide different cell layers. Therefore, by shaping tissues and organs, embryonic cell divisions dictate multicellular morphogenesis.

Hence option A: Trophoblast is the correct answer.

Note:Trophoblasts supply nutrients to the embryo and change into an outsized part of the placenta.