Under the influence of the trophoblast, maternal blood vessels in the endometriu

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

ans 29) after the implantation of foetal on endometrium wall so that foetal trophoblast invadeds the endometrium wall because foetal start developing in size so for their proper adjustment and development it break down endometrial blood vessel into the lacunae and forms villi around it.'C'

ans30) the space which formed within the innercellmass is nothing but amniotic fold by which amniotic cavity form in which amniotic fluid present, function of amniotic fluid is to protect foetal from various mechanical shocks.'C'.

ans31) after formation of embryo two layers which form blastocyst (outer) and trophoblast (inner) then blastocyst start attach to endometrium and this process is known as implantation. ' B'

ans32) during germlayer formation ectoderm is one of layer which formed by outer germ cell responsible for forming neural tissue, epidermis layer, and outer lining of mouth, anusand nostrils etc.'C'

ans33) like ectoderm mesoderm is one of the layer of germ layer which is middle one and form muscles mainly muscular tissue in the body.'A'

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