ANSC 2340 Midterm: ANSC Midterm 2 Review
12 Dec 2016
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Document Summary
Acrosome: cap on the head that contains enzymes that can shoot through the zona pellucida. Acrosome reaction: the membrane on the cap is lost to release enzymes into the zp. In order for sperm to fertilize an oocyte, it must have the ability to be motile and have intact motile. Major sequence of events following deposition of spermatozoa in female tract: lots of barriers before oviduct. Hatched blastocyst: no longer has zp surrounding it. The space inside is important to allow movement of cells. The inner cells give rise to the offspring. Placenta: trophoblasts from the embryo and the uterus lining from the mother. It provides nutrients and oxygen and removes waste through the mother. Also prevents tissues adhesion (prevents limbs from sticking together) Allantois: this layer surrounding the allantoic cavity where waste is deposited. Where the embryo attaches to the uterine lining of the mother. This prevents muscles from contracting when progesterone drops (the myometrium will contract).
