BIO 251 - Unit Exam 5. Questions and Answers. A+ Complete Guide.

BIO 251 - Unit Exam 5. Questions and Answers. A+ Complete Guide. Part 1 of 3 - Part 1 32.0/ 40.0 Points From chapter 28 Question 1 of 22 4.0/ 4.0 Points Which part of a mature sperm contains enzymes which digest the coverings surrounding the ovulated oocyte?  A. middle piece  B. flagellum  C. nucleus  D. acrosome  E. nucleus Feedback: Good work; your answer is correct! Question 2 of 22 4.0/ 4.0 Points In the months preceding birth, the hormone which causes pelvic ligaments to become more flexible to enable widening of the pelvis during delivery is ________.  A. human chorionic gonadotropin  B. prolactin  C. prostaglandin  D. luteinizing hormone  E. relaxin Feedback: Good work; your answer is correct! Question 3 of 22 0.0/ 4.0 Points The placenta is formed by endometrial tissue of the uterine lining and the ________.  A. myometrium of the uterus  B. chorionic villi of the trophoblast  C. amnionic fluid  D. yolk sac  E. inner cell mass of the trophoblast Feedback: Projections from the trophoblast portion of the blastocyst, called chorionic villi, combine with uterine endometrial tissue to form the placenta, the structure by which maternal nutrients and oxygen are delivered to the developing embryo and wastes are carried away. Question 4 of 22 4.0/ 4.0 Points The usual site of embryo implantation and growth is the ___________.  A. perimetrium  B. endometrium