Male reproductive system and ejaculation-Male Reproductive Structures

Reproduction is the process by which organisms make more organisms like themselves. But even though the reproductive system is essential to keeping a species alive, unlike other body systems, it's not essential to keeping an individual alive. In the human reproductive process, two kinds of sex cells, or gametes GAH-meetz , are involved. The male gamete, or sperm, and the female gamete, the egg or ovum, meet in the female's reproductive system. When sperm fertilizes meets an egg, this fertilized egg is called a zygote ZYE-goat.

Male reproductive system and ejaculation

Male reproductive system and ejaculation

Male reproductive system and ejaculation

Tissues in the penis fill with blood and it becomes stiff and erect an erection. During fertilization, the sperm's mitochondria gets destroyed by the egg cell, and this means only the mother is able to provide the baby's mitochondria and mitochondrial DNA, which has an important application in tracing maternal ancestry. The Leydig cells produce testosterone as described belowwhich in turn Steriod cream for prostate most of Male reproductive system and ejaculation changes of male puberty. Prostate hypertrophy is usually benign, but cancer of the prostate is one of the more common cancers in elderly ans. Inside the Human Testes : Diagram illustrates the scrotum with a portion of the covering removed to display the testis. All Rights Reserved.

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Believe it or not, an erection actually starts in your brain. These polypeptide hormones correlate directly with Sertoli cell function and sperm number; inhibin B can be used as a marker of spermatogenic activity. If a man is healthy, he may be able to make sperm well into his 80s or longer. What special features are evident in sperm cells but not in somatic cells, and how do these specializations function? Fructose from seminal vesicles provides the nutrient energy for sperm, and prostatic fluid ejafulation their swimming movements. A mature human sperm consists ejaculahion a head, midpiece, and tail Figure 2. Secretes watery fluid that neutralizes acidity of the urethra and lubricates the glans penis. This area here, is known as the body. The skin of the penis is loose and elastic to allow for changes in penis size during an erection. Sperm counts—the total number of sperm a man produces—slowly decline after age 35, and some studies suggest that smoking can lower sperm counts irrespective of age. Though the epididymis does not Male reproductive system and ejaculation reproducive much room in its tightly coiled state, it would be approximately 6 m 20 feet long Pregnancy eating tips straightened. FSH and LH Male reproductive system and ejaculation produced by the pituitary gland located at the base of ejavulation brain. If a mass is detected, the cancer diagnosis is confirmed by biopsy of the cells.

The male reproductive system includes external penis, scrotum, epididymus, and testes and internal accessory organs.

  • The reproductive role of the human male is to produce sperm and deliver them to the vagina of the female.
  • The primary functions of the male reproductive system are the production of male sex hormones, the formation of sperm, and the placement of sperm in the female reproductive tract, where one sperm can unite with a female sex cell.
  • Unique for its role in human reproduction, a gamete is a specialized sex cell carrying 23 chromosomes—one half the number in body cells.
  • The external structures of the male reproductive system are the penis, the scrotum and the testicles.

In simple terms, reproduction is the process by which organisms create descendants. This miracle is a characteristic that all living things have in common and sets them apart from nonliving things. But even though the reproductive system is essential to keeping a species alive, it is not essential to keeping an individual alive.

In human reproduction, two kinds of sex cells or gametes are involved. Sperm, the male gamete, and a secondary oocyte along with first polar body and corona radiata , the male gamete must meet in the female reproductive system to create a new individual. For reproduction to occur, both the female and male reproductive systems are essential. It is a common misnomer to refer to a woman's gametic cell as an egg or ovum, but this is impossible.

A secondary oocyte must be fertilized by the male gamete before it becomes an "ovum" or "egg". While both the female and male reproductive systems are involved with producing, nourishing and transporting either the oocyte or sperm, they are different in shape and structure.

The male has reproductive organs, or genitals, that are both inside and outside the pelvis, while the female has reproductive organs entirely within the pelvis. The male reproductive system consists of the testes and a series of ducts and glands. Sperm are produced in the testes and are transported through the reproductive ducts. These ducts include the epididymis, vas deferens, ejaculatory duct and urethra.

The reproductive glands produce secretions that become part of semen, the fluid that is ejaculated from the urethra. These glands include the seminal vesicles, prostate gland, and bulbourethral glands.

The testes singular, testis are located in the scrotum a sac of skin between the upper thighs. In the male fetus, the testes develop near the kidneys, then descend into the scrotum just before birth. Testosterone is produced in the testes which stimulates the production of sperm as well as give secondary sex characteristics beginning at puberty.

The two testicles are each held in a fleshy sac called the scrotum. The major function of the scrotal sac is to keep the testes cooler than thirty-seven degrees Celsius ninety-eight point six degrees Fahrenheit.

The external appearance of the scrotum varies at different times in the same individual depending upon temperature and the subsequent contraction or relaxation of two muscles. These two muscles contract involuntarily when it is cold to move the testes closer to the heat of the body in the pelvic region. This causes the scrotum to appear tightly wrinkled. On the contrary, they relax in warm temperatures causing the testes to lower and the scrotum to become flaccid.

The temperature of the testes is maintained at about thirty-five degrees Celsius ninety-five degrees Fahrenheit , which is below normal body temperature.

Temperature has to be lower than normal in order for spermatogenesis sperm production to take place. The two muscles that regulate the temperature of the testes are the dartos and cremaster muscles:. The dartos muscle is a layer of smooth muscle fibers in the subcutaneous tissue of the scrotum surrounding the scrotum. This muscle is responsible for wrinkling up the scrotum, in conditions of cold weather, in order to maintain the correct temperature for spermatogenesis.

The cremaster muscle is a thin strand of skeletal muscle associated with the testes and spermatic cord. This muscle is a continuation of the internal oblique muscle of the abdominal wall, from which it is derived.

Seminiferous Tubules. Each testis contains over yards of tightly packed seminiferous tubules. The seminiferous tubules are the functional units of the testis, where spermatogenesis takes place. Once the sperm are produced, they moved from the seminiferous tubules into the rete testis for further maturation.

In between the seminiferous tubules within the testes, are instititial cells, or, Cells of Leydig. They are responsible for secreting the male sex hormones i. A Sertoli cell a kind of sustentacular cell is a 'nurse' cell of the testes which is part of a seminiferous tubule.

Its main function is to nurture the developing sperm cells through the stages of spermatogenesis. Because of this, it has also been called the "mother cell. Other functions During the Maturation phase of spermiogenesis, the Sertoli cells consume the unneeded portions of the spermatazoa. The sperm are transported out of the testis and into the epididymis through a series of efferent ductules. The testes receive blood through the testicular arteries gonadal artery. Venous blood is drained by the testicular veins.

The right testicular vein drains directly into the inferior vena cava. The left testicular vein drains into the left renal vein. The seminiferous tubules join together to become the epididymis. The epididymis is a tube that is about 2 inches that is coiled on the posterior surface of each testis. Within the epididymis the sperm incomplete their maturation full maturation occur in female genital tract and their flagella become mobile. This is also a site to store sperm, nourishing them until the next ejaculation.

Smooth muscle in the wall of the epididymis propels the sperm into the ductus deferens. Vasa efferentia from the rete testis open into the epididymis which is a highly coiled tubule. The epididymis has three parts- 1 head or caput epididymis- it is the proximal part of the epididymis.

It carries the sperms from the testis. The cauda epididymis continues to form less convoluted vas deferens. The ductus vas deferens, also called sperm duct, or, spermatic deferens, extends from the epididymis in the scrotum on its own side into the abdominal cavity through the inguinal canal. The inguinal canal is an opening in the abdominal wall for the spermatic cord a connective tissue sheath that contains the ductus deferens, testicular blood vessels, and nerves.

The smooth muscle layer of the ductus deferens contracts in waves of peristalsis during ejaculation. The pair of seminal vesicles are posterior to the urinary bladder. They secrete fructose to provide an energy source for sperm and alkalinity to enhance sperm mobility. The duct of each seminal vesicle joins the ductus deferens on that side to form the ejaculatory duct.

There are two ejaculatory ducts. Each receives sperm from the ductus deferens and the secretions of the seminal vesicle on its own side. Both ejaculatory ducts empty into the single urethra. The prostate gland is a muscular gland that surrounds the first inch of the urethra as it emerges from the bladder. The smooth muscle of the prostate gland contracts during ejaculation to contribute to the expulsion of semen from the urethra. The bulbourethral glands also called Cowper's glands are located below the prostate gland and empty into the urethra.

The alkalinity of seminal fluid helps neutralize the acidic vaginal pH and permits sperm mobility in what might otherwise be an unfavorable environment. The penis is an external genital organ. The distal end of the penis is called the glans penis and is covered with a fold of skin called the prepuce or foreskin. Within the penis are masses of erectile tissue. Each consists of a framework of smooth muscle and connective tissue that contains blood sinuses, which are large, irregular vascular channels.

The urethra, which is the last part of the urinary tract, traverses the corpus spongiosum and its opening, known as the meatus, lies on the tip of the glans penis. It is both a passage for urine and for the ejaculation of semen. The components of semen come from two sources: sperm, and "seminal plasma". Seminal plasma, in turn, is produced by contributions from the seminal vesicle, prostate, and bulbourethral glands.

The seminal plasma provides a nutritive and protective medium for the spermatozoa during their journey through the female reproductive tract. The normal environment of the vagina is a hostile one for sperm cells, as it is very acidic from the native microflora producing lactic acid , viscous, and patrolled by immune cells. The components in the seminal plasma attempt to compensate for this hostile environment.

Basic amines such as putrescine, spermine, spermidine and cadaverine are responsible for the smell and flavor of semen. These alkaline bases counteract the acidic environment of the vaginal canal, and protect DNA inside the sperm from acidic denaturation.

A World Health Organization report described normal human semen as having a volume of 2 ml or greater, pH of 7. The erection of the penis is its enlarged and firm state. It depends on a complex interaction of psychological, neural, vascular and endocrine factors. The term is also applied to the process that leads to this state. A penile erection occurs when two tubular structures that run the length of the penis, the corpora cavernosa, become engorged with venous blood.

This is a result of parasympathetic nerve induced vasodilation. This may result from any of various physiological stimuli. The corpus spongiosum is a single tubular structure located just below the corpora cavernosa, which contains the urethra, through which urine and semen pass during urination and ejaculation, respectively. This may also become slightly engorged with blood, but less so than the corpora cavernosa.

An erection results in swelling and enlargement of the penis. Erection enables sexual intercourse and other sexual activities sexual functions , though it is not essential for all sexual activities. Emission is the term used when sperm moves into the urethra. Ejaculation is the term used when sperm is forced out of the urethra and the penis.

These are both stimulated by sympathetic nerves. A spermatozoon or spermatozoan pl. Spermatagonia divides several times during the process of sperm development.

The entire process of sperm formation and maturation takes about weeks. The separate divisions that take place and what happens in each are as follows:.

The continued presence of testosterone is necessary to keep the male reproductive system working properly, and Leydig cells produce approximately 6 to 7 mg of testosterone per day. Epididymis The seminiferous tubules merge into a network of tiny tubules called the rete testis L. This migration occurs under the stimulation of testosterone. Remember, now that we're erect, we've filled these vascular chambers here with blood. Gametes are the reproductive cells that combine to form offspring.

Male reproductive system and ejaculation

Male reproductive system and ejaculation. Accessory Glands

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ejaculation | Definition & Process | disneytattooguy.com

Sexual Health Ejaculation: how it works. When a man is sexually stimulated, friction on the glans penis and other stimuli send signals through the nervous system that result in ejaculation. At the moment of ejaculation the walls of the epididymis contract squeeze to create peristaltic waves that push sperm into the vas deferens. Nerves also stimulate the seminal vesicles and the prostate to contract which forces semen the mixture of sperm and secretions into the urethra.

Muscles surrounding the urethra contract and propel semen out of the penis. To prevent semen from flowing backwards into the bladder, the muscles in the neck of the bladder tighten to close it off. Delayed ejaculation is when a man takes longer than desired to climax and ejaculate release semen from the penis.

Sometimes, ejaculation does not happen at all. The spongy erectile tissue of the penis fills with blood during an erection.

View this illustrated explanation of how erection works. Good news for high-frequency ejaculators, as study finds the more frequently a man ejaculates, the lower his risk of prostate cancer. Merck Manual for Healthcare Professionals. Overview of male sexual function updated Feb Andrology Australia. Premature ejaculation updated Sep Sexual problems as a result of having diabetes can affect both men and women. Find out about the causes and treatments.

Male sterilisation, or vasectomy, is a form of permanent, surgical contraception that involves cutting and tying the 2 tubes vas deferens that carry sperm from the testes to the penis. View our diagram of the male reproductive organs, including the penis, testicles, prostate, urethra and vas deferens.

Sexual Health. Related Articles. Premature ejaculation Premature ejaculation: what is it, what are the causes and what treatments are available? Delayed ejaculation Delayed ejaculation is when a man takes longer than desired to climax and ejaculate release semen from the penis. Erection: how it works The spongy erectile tissue of the penis fills with blood during an erection. Frequent ejaculation lowers prostate cancer risk Good news for high-frequency ejaculators, as study finds the more frequently a man ejaculates, the lower his risk of prostate cancer.

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Male reproductive system and ejaculation

Male reproductive system and ejaculation

Male reproductive system and ejaculation