Textbook QuestionThe stage of development that follows cleavage is the(a) Blastocyst(b) Morula(c) Trophoblast(d) Blastocoele28views
Textbook QuestionThe pre-embryo develops into a multicellular complex known as a (a) Blastocyst(b) Trophoblast(c) Lacuna(d) Blastomere31views
Open QuestionWhich of the following changes occur in the baby’s cardiovascular system after birth? (a) umbilical arteries and vein become fibrosed(b) pulmonary circulation begins to function, and pressure in the left side of the heart increases(c) the ductus venosus becomes obliterated, as does the ductus arteriosus(d) all of these12views
Open QuestionWhy is it that only one sperm out of the hundreds (or thousands) available enters the oocyte?6views
Multiple ChoiceTrue or False (if false, choose the answer that would correct the statement): Conception is the moment an embryo begins to develop.620views13rank
Multiple ChoiceDuring the initiative-versus-guilt stage of human development, who do young children most commonly identify with?170views