Animal reproduction - In placental mammals, an embryo develops fully within the mothers uterus - Conception, embryonic development, and birth
5 important questions on Animal reproduction - In placental mammals, an embryo develops fully within the mothers uterus - Conception, embryonic development, and birth
What is the function of the alkalinity of semen?
It helps neatralize the acidic environment of the vagina, protecting the sperm and increasing their motility.
What happens with the semen after ejaculation?
First it coagulates, soon after, anticoagulants liquefy the semen and the sperm begin swimming through the uterus and the oviduct.
Describe what the blostocyst is.
It is an embryonic stage in which a central cavity is surrounded by a sphere of cells. This stage occurs about 1 week after fertilization.
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What happens when an embryo implants in the endometrium?
It secretes hormones that signal its presence and regulate the mother's reproductive system. One embryonic hormone human chorionic gonadotropin (hCG) acts like pituaitary LH in maintaining secretion of progesterone and estrogens by the corpus luteum through the first few months of pregnancy.
Why does the embryo secrete hCG in the first few months?
Because otherwise with the dropping LH levels, the corpus luteum would degenerate causing the progesterone and estradiol levels to go down causing a menstruation that takes the fetus with it.
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