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¸„ø¤º°¨Male reproductive organ¨°º¤ø„¸

Male has two visible sex organs, the testes (or testicles) and penis. The testes are the primary male sexual organs in that they make sperm and produce testosterone. The sperm is the male sex cell, or gamete, and each testicle produces more than 4 million new sperm per hour.
The testes are housed outside of the main part of the male's body, in a sac called the scrotum. This location is important because in order for the sperm to develop properly, they must be kept at a temperature about two degrees cooler than normal body temperature. It takes sperm about 4 to 6 weeks to mature, which they do as they travel from each testis to a coiled tube on the outer surface of each testis called the epididymis. Sperm, which are often compared to tadpoles in appearance, use their tails to travel, while the head contains the genetic material.
The penis is made of soft, spongy tissue that can expand or contract. When a man becomes sexually aroused, the penis becomes engorged with blood, causing the spongy tissues to stiffen and the penis to become erect. This erect state makes it easy to place the penis inside a woman's vagina during sexual intercourse. During sex, the male reproductive system is still at work, equipping the sperm with the assistance they will need to fertilize an egg.

During sexual intercourse, smooth muscles contract and propel mature sperm from the end portions of the epididymis through a long tube called the vas deferens, which is inside the body, just beneath the bladder. From there, the sperm get mixed with nutrient-rich fluids from the seminal vesicles and a milky secretion from the prostate gland. This combination of sperm and fluids is called semen. The semen does three things:
Provides a watery environment in which the sperm cells can swim while outside the body
Provides nutrients for the sperm cells (fructose, amino acids and vitamin C)
Protects the sperm cells by neutralizing acids in the female's sexual tract
Once the semen is made, it passes through the urethra, which is within the penis, exiting the body through a small slit at the tip of the penis in a process known as ejaculation. The average ejaculate contains about one teaspoon of seminal fluid, and only one percent of the mixture is sperm [source: Angier].
One last male reproductive organ is a tiny, pea-sized set of glands inside the body at the base of the penis, called the bulbourethral or Cowper's glands. During sexual excitation, and just prior to the ejection of sperm, the Cowper's glands secrete a tiny amount of fluid that neutralizes any traces of acidic urine that may be leftover in the urethra. It is also believed that these secretions are designed to lubricate the penis and female tract during sexual intercourse.


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