Which of the following is an extraembryonic tissue that burrows into and thus attaches to maternal tissues?
A) the amnion
B) the yolk sac
C) the chorion
D) the blastocyst protein coat
E) the inner cell mass

Question

Quizplus · Accepted Answer

The chorion is the outermost extraembryonic membrane that develops villi which burrow into and attach to the maternal tissues, forming the placenta. The amnion is a fluid-filled sac that surrounds and protects the developing embryo. The yolk sac is important in providing nutrients to the developing embryo in some species, but does not burrow into maternal tissues. The blastocyst protein coat is shed before implantation occurs. The inner cell mass eventually forms the embryo itself, but does not burrow into maternal tissues.

Which of the Following Is an Extraembryonic Tissue That Burrows