Under the influence of the trophoblast, maternal blood vessels in the endometriu
ID: 79835 • Letter: U
Question
Under the influence of the trophoblast, maternal blood vessels in the endometrium A) disappear. B) attach to the inner cell mass. C) break down and form lacunae. D) form a capillary network in the trophoblast. E) increase in size and penetrate the blastocyst. A space opens within the inner cell mass that will form the A) blastocoele B) lacunae. C) amniotic cavity. D) chorion. E) allantois Attachment to and penetration of the endometrium by the blastocyst is referred to as a) cleavage. B) implantation C) placentation. D) embryogenesis E) fertilization. The ectoderm forms A) muscle. B) blood C) neural tissues. D) the lining of the stomach and small intestine. E) the urinary system. The mesoderm forms A) muscle. B) epidermis. C) the brain. D) the lining of the digestive tract. E) respiratory epithelium.Explanation / Answer
29. C - It breaks downs and forms a lacunae
30. C - Amniotic cavity
31. B - Implantation - It happens after 6-7 days of fertilization.
32. C - Neural tissue - Ectoderm is outer layer of embryo makes a neural related tissues
33. A - Muscles - Mesoderm is a middle layer in embryo makes muscle tissue, connective tissue, lympatic system, circulatory system etc.
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