Related to Precordial pain: costochondritis, Pulsus paradoxus, retrosternal pain. unpleasant or hurtful sensation resulting from stimulation of nerve endings. The stimulus is carried by nerve fibers to the spinal cord and then to the brain, where the nerve impulse is interpreted as pain.
Full transcript. The sperm race begins Ejaculation The race resumes A man's penis releases around 20 million sperm into the woman's vagina, where they then begin their journey.Around 2,000 sperm then travel up to the top of the vagina and through the cervix.aiting for the egg When the sperm are awakened they travel to egg and the race resumes. Time to be born The mother's Muscles contract to push the baby out. The amnion sack breaks ('water' breaks). The head moves into the entrance of the vagina.
If an egg is present and ready to be fertilized, the woman will become pregnant. In general, the fastest sperm can swim to the womanâs eggs within 30 minutes. Slower sperm take up to several days to reach the eggs. On average, sperm will only live in the female reproductive organs for about 48 hours to 72 hours. After this time period, they begin to die out. Although millions of sperm may enter the womanâs body, only a few hundred or less will actually reach the egg. Once it does reach the egg, a single sperm that swam the fastest will penetrate the egg. After this happens, the sperm and egg become a zygote. Rapid cell multiplication leads to the formation of an embryo. This later becomes a fetus, and transforms into a baby after nine months.