1, male semen
Semen is a milky white or yellowish liquid with a special smell secreted by male gonads and accessory organs, which is discharged from the urogenital tract during ejaculation. Semen consists of sperm and seminal plasma, of which sperm accounts for about 5% and the rest is seminal plasma. Sperm is a male germ cell, and seminal plasma has the functions of transporting sperm, providing sperm nutrition and stimulating sperm vitality.
Sperm is produced by testicles. The number of sperm per milliliter of semen is generally between 60 million and 200 million. Viable sperm accounts for more than 60% of the total, and abnormal sperm accounts for less than 10% of the total. Sperm motility lasts for 3-4 hours at room temperature.
Seminal plasma is a mixture of male accessory gonad secretions, which mainly comes from seminal vesicle and prostate. Among them, 60% came from seminal vesicle, 30% from prostate, and 10% came from epididymis, ampulla of vas deferens, urethral ball gland and urethral gland. When ejaculating, semen needs to undergo a series of physical and chemical reactions, such as coagulation, gelation and liquefaction, in order to turn semen into liquid. In addition to water, fructose, protein and fat, seminal plasma also contains a variety of enzymes and inorganic salts, prostaglandins and some enzymes, which are the nutrients of sperm.
Semen is a means to evaluate male fertility.
① Understand whether the ejaculation process is barrier-free: According to the normal ejaculation sequence, check the changes of biochemical components of prostate, epididymis and ampulla with a large number of sperm and seminal vesicles to judge the ejaculation disorder.
② Semen examination of unexplained male infertility: the release of lactate dehydrogenase in sperm increases, which often indicates infertility; Arginine can enhance sperm motility; Chymotrypsin weakens sperm motility; Zinc concentration plays an important role in regulating fertility.
③ Identification of male reproductive defects: Obstruction of any part of male reproductive tract can affect semen discharge. For example, after semen is discharged, semen does not coagulate, fructose is low or not, pH is lower than 6.7, and volume reduction indicates that there is no seminal vesicle secretion. Another example is that semen is not liquefied, which means that citric acid or acid phosphatase is reduced and prostatic fluid is lacking, which may be caused by inflammation or obstruction of prostatic canal. An increase in semen volume indicates prostatic hypertrophy or prostate cancer. High zinc and fructose indicate excessive secretion of seminal vesicle, which is not good for sperm motility.
④ Evaluation of endocrine function: Changes in biochemical components of seminal plasma can also be caused by changes in androgen in human body. For example, testicular dysplasia leads to androgen deficiency, which leads to a decrease in fructose concentration.
⑤ Providing health information: Quantitative determination and physical and chemical analysis of semen components can judge testicular function and disease state, thus determining reproductive level and health status.
2. Abnormal semen volume is related to diseases.
Normal male ejaculates 2-7 ml of semen at a time. Frequent masturbation or frequent sexual life may lead to less and thinner semen during ejaculation. There are also some oligospermia, which may be caused by testicular dysfunction, endocrine disorders, seminal vesicle prostate disease or urethral stricture. They should see a doctor and receive treatment. Excessive semen output, such as more than 7 ml, is also a pathological condition, which is mostly caused by seminal vesicle inflammation.
How to prevent nocturnal emission? The main reason of nocturnal emission is that the inhibition process of cerebral cortex is weakened and the excitability of central nervous system is enhanced. When there is sexual stimulation, nocturnal emission often occurs. Underwear is too tight, skin scales are irritating, etc. It can cause reflex nocturnal emission, balanitis prepuce, inflammation of urethra, prostate and seminal vesicle. Wait. However, most of them have many misunderstandings about sex because of their lack of sexual knowledge and watching pornographic books and videos. Can cause tintin to erect and ejaculate.
There is a story that there was an emperor in ancient times, too much sex. After the queen's bitter persuasion failed, she frightened him and said, "The amount of semen that a person can discharge in his life is about 4 buckets." When the last drop of semen is used up, a bead will flow out, which says' gone' and will never have sex again. "The emperor was so scared that he never lusted after women as before.