At the start of puberty, pituitary gland in the brain gives signals to the testicles to start releasing testosterone. Testosterone produces physical and emotional changes in the person, changing the boy into an adult male.
Under the influence of testosterone, the testicles start producing sperm – the male reproductive cell. Both the testicles are contained in a sac called the Scrotum- which helps in regulating temperature as sperm producing cells are very temperature sensitive. Sperms move from the testis into the Epididymus where they mature. Ejacualation is the process where the sperms are released from the body through the penis. Just before ejaculation the sperm move from the epididymus into the Vas deferens. Here they collect Semen - a whitish fluid that provides the sperm with nourishment. Semen is a combination of the fluid given by the Seminal vesicles, Prostate Gland and the Cowper's Gland.
Ejaculation can occur only when the penis is erect. When sexual feelings arise in the brain, it releases chemicals that increase blood flow into the Penis. The penis become hard, engorged and erect because of this rush of blood and this is called an erection. At the height of sexual pleasure the semen is released from the body through the Urethra- the same tube that is used for urination. There is a special mechanism that prevents urine from coming out during ejaculation. Once semen has been released, the blood flow returns to normal and the penis returns to its original state.
A man produces millions of sperm everyday. There are approximately 100 million sperms in 1ml of semen. Typically 2-5 ml of semen is released with each ejaculation.
During puberty a boy may experience erection and ejaculation during sleep. This is called a wet dream or night fall and is very normal.
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An erection is a complex event that requires the interaction of the brain, nerves, hormones, and blood vessels. This process is separate from ejaculation and orgasm, both of which can occur without an erect penis. The male hormone testosterone, which is secreted by the testicles, controls the function of the penis and a man's sex drive. The brain starts the changes that will produce an erection. http://www.buy-viagra-with-us.com/
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