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Endometrial bleeding occurs during the menstrual cycle.

The endometrium is reabsorbed by the uterus during the estrous cycle.

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Q: How do the estrous and menstrual cycles compare?
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Does a doe as in deer have a menstrual cycle?

No. Humans are the only mammals with menstrual cycles. Deer, as well as other mammals, have estrous cycles. http://en.wikipedia.org/wiki/Estrous_cycle


What is the average estrous length for women?

The typical menstrual cycle length is around 28 days, but everyone is different. It's also perfectly normal for there to be a few days variation from one cycle to the next cycle.


What is the length of the estrous cycle in pigs How does this compare with humans?

The estrous cycle of pigs is 21 days. Humans have a menstrual cycle which can last from 21-35 days.


What fish have menstrual cycles?

only people have a menstrual cycle but mammals have something called Estrous cycle and there is sometimes bloody discharge. fish are not mammals and they don't have it.


Do butterflies have periods?

No, butterflies do not have menstrual cycles so that means they don't have periods. Only primates (this includes humans), jumping shrews, and quite a few species of bats have menstrual cycles. There is another type of cycle called an estrous cycle that most other female mammals have, but butterflies are not mammals.


What is the difference between estrous and menstrual cycle?

The estrous cycle comprises the recurring physiologic changes that are induced by reproductive hormones in most mammalian placental females. Humans and great apes undergo a menstrual cycle instead. Estrous cycles start after puberty in sexually mature females and are interrupted by anestrous phases. Typically estrous cycles continue until death. Some animals may display bloody vaginal discharge, often mistaken for menstruation. Mammals share the same reproductive system, including the regulatory hypothalamic system that releases gonadotropin releasing hormone in pulses, the pituitary that secretes follicle stimulating hormone and luteinizing hormone, and the sex hormones including estrogens and progesterone. However, species vary significantly in the detailed functioning. One difference is that animals that have estrous cycles reabsorb the endometrium if conception does not occur during that cycle. Animals that have menstrual cycles shed the endometrium through menstruation instead. Another difference is sexual activity. In species with estrous cycles, females are generally only sexually active during the estrous phase of their cycle (see below for an explanation of the different phases in an estrous cycle). This is also referred to as being "in heat." In contrast, females of species with menstrual cycles can be sexually active at any time in their cycle, even when they are not about to ovulate. Humans, unlike some other species, do not have any obvious external signs to signal receptivity at ovulation (concealed ovulation). Research has shown however, that women tend to have more sexual thoughts and are most prone to sexual activity right before ovulation. Hope this helps! Best of Luck!


What animals have periods?

Humans and chimpanzees are the only animals that have "periods" or menstrual cycles. Other animals of the animal kingdom undergo Estrus, or heat periods (spikes in Estrogen output) during their Estrous cycle.


Do sheep have menstrual cycles?

No


Can you conceive when you don't have menstrual cycles?

No.


Why do humans have a menstrual cycle while most other mammals have an estrous cycle?

Most mammals have estrous cycles while humans have menstrual cycles because when the uterine lining breaks down in humans, it needs to escape the body while in other mammals it is absorbed back into the body instead of flowing out of the body as menses. Most mammals feel a great desire to have sex whenever they are fertile or when they are in the presence of a fertile male. But for humans, we could have the desire to have sex in any part of the month. Female humans tend to feel an even greater desire for sex during their period.


Why did my menstrual cycles change?

because it just does.


Can Cipro affect your menstrual period?

Delayed menstrual cycles have been reported when taking Ciprofloxacin. The delay can also be caused by the urinary tract infection. Both can cause delayed menstrual cycles.