What goes in hard and comes out soft?

The male reproductive organ is the male reproductive system, which is the human organ for male reproduction and procreation. It consists of two parts: the internal and reproductive organs. The reproductive organ includes the scrotum and male genitals; the internal genitals include the prostate gland (male testicles), the ejaculatory duct (attached testicular cyst, ejaculatory duct, vas deferens and urethral opening) and its attached glandular ducts, seminal vesicles, male prostate and bulbourethral glands. The male reproductive organ begins to grow and develop during puberty, and after growth and development are complete, it has the function of reproduction.

Components

Male testicles

The key role is to produce male sperm and metabolize androgen (testosterone). The fusion of male sperm and egg cells for fertilization is the key material condition for the reproduction of offspring; testosterone is the key substance for maintaining male secondary sexual characteristics (secondary sexual characteristics).

Epididymal cyst

The key function is to promote the growth, development and maturity of sperm, as well as to store and transport (transport) sperm. Sperm is produced from the seminiferous tubules of the testicles, but lacks the ability to move and has no reproductive function. It needs to continue to grow and develop to maturity, and this link is mainly carried out in the epididymal cyst. The epididymal cyst metabolizes a fluid that directly nurtures sperm maturity, called epididymal cyst fluid, or sperm night. Its fluid has high potassium, high concentration of ammonium sulfate bile salt, high glycosylation concentration, low pH acidity and alkalinity, high plasma osmotic pressure, low oxygen and high carbon dioxide.

Ejaculatory duct

The strong peristaltic ability is due to the thick wall muscles. The main function is to transport and metabolize sperm. When a man ejaculates, the central nerve endings release a large number of adrenal hormones, which make the ejaculatory ducts produce a harmonious and strong contraction, and quickly transport sperm to the seminal metabolic duct, vas deferens and urethra.

Seminal vesicle

The main function of the seminal vesicle is to metabolize a kind of mucus, which neither produces nor stores sperm. It contains seminal vesicles. The secretion of the seminal vesicle contains mucus, ammonium sulfate bile salt, blood protein, sodium citrate and glycosides, etc. The main components are lysozyme (125mg/100ml) and glycosides (315mg/100ml). They are the main components of semen (accounting for about 50% to 80%). They are discharged after ejaculation. Glycosides are the main energy source for sperm activity in ejaculation.

Fine Song

The key function is to suspend the testicles and epididymal cyst in the scrotum, protect the testicles and epididymal cyst from damage, and at the same time contract or relax with temperature changes, so that the testicles can adapt to the external environment, maintain the best conditions for sperm production and make the testicles have no free movement (levator testis).

Vas deferens

The key function is that men ejaculate, the muscles of the vas deferens wall are rich and colorful, with strong contraction, which helps the ejaculation of semen, and the opening of the vas deferens located on the urethral opening is small and narrow. To ensure that men have the necessary pressure for ejaculation, on the other hand, the semen passes through the narrow opening, as if there is a "squeezing" feeling, through the nerve reflex, triggering the male's sexual sensation of ejaculation, and then reaching the sexual pleasure period.

Male genitalia

The key functions are urination, male ejaculation and sexual life. It is a key human organ in sexual life. The skin of male genitals is very thin, there is no body fat under the skin, it is active and flexible, the blood sinuses of the corpus cavernosum can be attached to blood, when there is no sexual excitement, the male genitals are soft, when there is sexual excitement, the blood in the blood sinuses of the corpus cavernosum, the growth hormone increases, the male genitals become huge, enlarged, thickened and hardened. When the injected blood and the returned blood are the same, the male genitals continue to harden; the peripheral nerves of the male genital head are rich and colorful, and it is extremely sexy and charming. When the sexual life reaches the climax, the high-width arousal of the ejaculation center causes the man to ejaculate. If the male genitals cannot erect or the penis is not hard enough under sexual excitement, it is impossible to engage in sexual activities, which is called "impotence". Abnormal genital erection or penis deformity may cause difficulty in sexual life.