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Menstrual Cycle- Reproduction
Menstrual cycles are characteristic of primates and do not occur in other vertebrate groups. The length of the cycle is highly variable, though 28 days is generally regarded as typical for human female. The cycle in the chimpanzee rehires about 35 days. Both estrous and menstrual cycles are regulated by the same interplay of pituitary add ovarian hormones, and the effects of the ovarian hormones on the reproductive tract are comparable in most respects. The chief differences between the two types of cycles are;
During the menstrual phase the superficial layers of the endometrium are sloughed rupturing spiral arteries, resulting in bleeding. This type of bleeding does not occur in nonprimates. Spiral arteries are absent from the uteri of estrous mammals but are present in primates with the exception of the New World monkeys. New World monkey menstruate, but the of blood is greatly reduced. The menstrual phase lasting four to seven days is regarded as the beginning of the primate cycle. This arrangement is sanctioned because menstruation is the easiest period of the cycle to recognise and because it corresponds with the formation of new follicles in the ovaries. However, if the uterus alone is considered, menstruation represents the terminal event with subsidence of the corpus luteum and a consequent deficiency of ovarian hormones. The endometrium cannot maintain itself and hence regresses and the surface disintegrates.
Explain some Features of Aspergillus? The identifying features include: 1. Macroscopically Aspergillus colonies are powdery and are of different colours like green, blue, bl
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In studies of human body, which of the below terms is used to describe hereditary condition associated with an excessively high level of uric acid in blood? a) Uric ptosis b
An hypothesis for the extinction of the dinosaurs is that the earth had been hit by a gigantic meteor that caused the death of those big reptiles. In that case the entire genetic p
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Elaborates the Pathophysiology of ventricular septal defect? The shunt in the VSD is left to right. The magnitude of the shunt is determined by the size of the VSD and the, lev
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These are safe and free of systemic side effects. However, gastrointestinal side effects are common, and compliance is poor. The average LDL decreases by approximately 15 per cent
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