How long does an ovum stay alive?

Answer 1

The cycle starts when a follicle grows within one of the ovaries. A follicle is composed of the developing egg cell and the support cells that surround and nourish it. Throughout the first portion of the cycle, a small structure in the brain, the pituitary, releases hormones, mostly FSH. This causes follicles to begin growing. One of the follicles becomes dominant and releases estrogen, a hormone that prepares the lining of the uterus to receive a fertilized egg cell. Meanwhile, the estrogen in the blood stream causes the brain to release a surge of LH. In response to the LH surge, the follicle enlarges rapidly. About 24 to 36 hours after the LH surge, the follicle ruptures and releases the egg cell in a process known as ovulation. The ruptured follicle begins secreting the hormone progesterone, which also helps to prepare the uterine lining for a fertilized egg cell. The large structure on the right is the entrance to the fallopian tube. The smaller, waving structures at its opening are called fimbriae. They're moving a lot because it's their job to sweep the egg cell into the fallopian tube's entrance and toward the uterus. Once the egg cell is within the fallopian tube, one of two things will happen to it: it will either be fertilized by a sperm cell, or fertilization will fail to take place. If the egg cell is NOT fertilized within 12 to 24 hours after its release from the ovary, it will stop developing and will dissolve before reaching the uterus. The absence of a fertilized egg cell gradually causes a woman's body to stop releasing the hormones that would otherwise prepare the uterus for the developing egg cell. In response, the uterus sheds its lining. Menstruation signifies the start of the next menstrual cycle and lasts from 2 to 7 days. If the egg cell DOES become fertilized by a sperm, it will be transported by tiny hair-like cells called cilia to the uterus. There, it lodges in the uterine wall in a process called implantation, and receives nourishment from the uterine lining. Meanwhile, back in the ovary, the remaining cells of the ruptured follicle produce progesterone so that the uterine lining will stay rich in blood vessels, and the fertilized egg cell will survive. As you can see, the hormones, which control the reproductive system, maintain a delicate balance over the life cycle of the egg cell.

Answer 2

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Answer 3

Mostly 20 hours without fertilization but it can be anything up to two days (this is usually if two eggs are released because they will be released 24 hours part)

Answer 4

The life of an unfertilized ovum lasts for between 12 and 24 hours after having been released from an ovary. An unfertilized egg is shed from the body during menstruation.

Answer 5

The egg that is released upon ovulation can survive for up to 24 hours. Although as multiple eggs can be released during ovulation there can be a viable egg present for up to 48 hours.

Answer 6

12-24 hours.

Answer 7

72 hours