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.
Semen should be thick to start with and become thinner 10 to 15 minutes after ejaculation. Semen that stays thick may make it difficult for sperm to move. Sperm concentration. Also called sperm density, this is the number of sperm in millions per milliliter of semen. Fifteen million or more sperm per mL is considered normal. Sperm motility. This is the percentage of sperm in a sample that are moving, as well as an assessment of how they move.