unit 10 - development and inheritance Flashcards
what is a blastomere
each name of daughter cell produced by cleavage
what’s a morula
cells that were loosely grouped are now more compacted and look more like a solid mass
what’s an embryo
a group of cells within the blastocyst form an inner cell mass that is fated to become an embryo
what are trophoblasts
cells that form the outer shell of the embryo
what is totipotent
inner mass of embryonic cells -> only lasts for a few days
what’s implantation
when the blastocyst embeds itself in the uterine lining via the trophoblast cells
what is syncytiotrophoblast
multinucleated body that digests endometrial cells to firmly secure the blastocyst to the wall
what’s an amnion
fills w amniotic fluid that eventually grows to surround the embryo
what’s the yolk sac
supplies some nutrients absorbed from the trophoblast and also provides blood circulation during 2nd and 3rd week development
what is the allantois
excretory duct of the embryo that will become part of the urinary bladder
what’s the chorion
involved with growth and development of the placenta
whats gastrulation
when the cells transition from an undifferentiated to a more differentiated state
what’s the endoderm
forms epithelial lining of the gastrointestinal tract, liver, pancreas and the lungs
whats the mesoderm
becomes the skeleton, muscles, heart, connective tissue kidneys and blood vessels
what’s the ectoderm
gives rise to cell lineages that differentiate to become central and perph nervous systems, sensory organs (skin hair and nails)
