What is polyspermy and how is it achieved or inhibited in human fertilisation? Using a flowchart illustrate the positive feedback mechanism that occurs during (i) lactation and (ii) parturition
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What is polyspermy and how is it achieved or inhibited in human fertilisation?
Using a flowchart illustrate the positive feedback mechanism that occurs during (i) lactation and (ii) parturition
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- where does fertilization occur in the oviduct of a human female ?What would be the external genital appearance of a mammal exposed to high levels of both androgens and estrogens during early development? What if it were exposed to low levels of both?Explain the importance of calcium in internal and external fertilization.
- If fertilization occurs, the corpus luteum continues to produce hormones under the direction of Human Chorionic Gonadotrophin (HCG), which is produced by the embryo. By the third month, what begins to produce estradiol and progesterone?What are implants? How do they help in preventing fertilisation?Outline the role of the fetal hypothalamic-pituitary axis in parturition and given reasons why this axis might be activated just prior to parturition
- Which plane would be helpful when viewing the heart and the right kidney at the same time? whychose that plane and why the remaining planes would not be helpful when viewing these specific organs at the same time. Enzymes are important during the process of fertilization. What would be the anticipated consequences if the level of acrosin was low or non-existent in the acrosome? What is the name of the outer cell layer of the blastocyst and what does it give rise to? Does this layer contribute to the development of the embryo?Describe a positive feedback mechanism that contributes to ovarian cycling. If the ovulated oocyte becomes fertilized, what causes ovarian cycling to stop for the duration of the pregnancy? On approximately what date(s) would Anita have her highest estrogen levels On what date(s) would Anita most likely have a successful fertilization?What happens in the process of fertilization in animals and humans?
- A female egg cell has two outer membranes how does the egg cell prevent polyspermy? if polyspermy happens, will the fertilization be viable?What are the three main cell types formed during gastrulation? Give examples of which tissues are formed from each cell type.What is a doula? What does human development research say about the use of support during labor?