Mostrando entradas con la etiqueta PENIS. Mostrar todas las entradas
Mostrando entradas con la etiqueta PENIS. Mostrar todas las entradas
THE ANGEL 5
SEX
In biology, sex is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into male and female types (or sexes). Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents. Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism.
An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.
In biology, sex is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into male and female types (or sexes). Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents. Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism.
An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.
The biology of human sexuality examines the influence of biological factors, such as organic and neurological response, heredity, hormones, and sexual dysfunction; it examines the basic functions of reproduction and the physical means to carry out sexual intercourse. The biological perspective helps to analyze the factors, and ultimately aids in understanding them and using them to deal with sexual problems.
WHAT IS SEMEN?
Etiquetas:
CORRIDAS,
CUBANA,
EYACULACION,
EYACULATION,
PENIS,
SEMEN
What is semen?
Semen is a white or grey liquid, emitted from the urethra (tube in the penis) on ejaculation.
Usually, each millilitre of semen contains millions of spermatozoa (sperm), but the majority of the volume consists of secretions of the glands in the male reproductive organs.
The purpose of semen is purely for reproduction, as a vehicle to carry the spermatozoa into the female reproductive tract. Although ejaculation of semen accompanies orgasm and sexual pleasure, erection and orgasm are controlled by separate mechanisms and semen emission is not essential for enjoyable sex in most people.
Where is semen made?
Semen consists of the secretions of several glands but only 5 per cent comes from the testicles.
Where semen is made
Contributing gland Percentage of whole ejaculate
Testicles and epididymes 5 per cent
Seminal vesicles 46 to 80 per cent
Prostate gland 13 to 33 per cent
Bulbourethral and urethral glands 2 to 5 per cent
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Testicles and epididymes
The spermatozoa take over 70 days to develop and are produced solely in the testicles. Individual sperm develop within the testicles from a cell called a spermatogonium.
The spermatogonium divides to produce spermatocytes, which then develop into spermatids. The spermatid develops its familiar tail and the cell gradually acquires the ability to move by beating its tail.
The spermatid eventually develops into a mature spermatozoan. This process takes about 60 days and the sperm then takes a further 10 to 14 days to pass through the ducts of each testicle and its sperm-maturing tube, the epididymis, before it can leave the body in the semen, during ejaculation.
The fluid produced by the testicles contains several chemicals, but is particularly rich in testosterone.
Seminal vesicles
The seminal vesicles usually contribute more than half of the seminal volume. Their secretions are particularly rich in a sugar called fructose, which is an essential nutrient for the spermatozoa. They also produce a substance that causes the semen to clot (become sticky or jelly-like) after ejaculation, thought useful in reproduction for keeping the semen at the neck of a woman's womb.
Prostate gland
The secretions of the prostate gland contain several chemicals, of which prostate specific antigen (PSA) is probably the most interesting. PSA is an enzyme, a catalyst that causes biochemical reactions, in this case a type of enzyme called a coagulase. The prime function of PSA is to liquefy the clotted semen, so that the spermatozoa can escape from it and swim off to fertilise the ovum (egg) in the woman's reproductive tract.
Prostate gland cells produce PSA and some of it leaks into the blood stream, as well as appearing in semen. The bigger and more active the prostate gland is, the more PSA appears in the blood. Men with big, benign (non-cancerous) prostate glands often have higher blood levels of PSA than average. Men with prostate cancer may have very high levels. However, PSA levels can also be normal in both conditions. It is a useful marker of prostate gland size and activity, but is not a specific test for prostate cancer.
Bulbourethral and urethral glands
The secretions of these glands lubricate the male reproductive tract, but they may also contain antibodies that can affect fertility. These anti-sperm antibodies can prevent the spermatozoa moving properly and prevent them from fertilising the ovum (egg).
Semen is a white or grey liquid, emitted from the urethra (tube in the penis) on ejaculation.
Usually, each millilitre of semen contains millions of spermatozoa (sperm), but the majority of the volume consists of secretions of the glands in the male reproductive organs.
The purpose of semen is purely for reproduction, as a vehicle to carry the spermatozoa into the female reproductive tract. Although ejaculation of semen accompanies orgasm and sexual pleasure, erection and orgasm are controlled by separate mechanisms and semen emission is not essential for enjoyable sex in most people.
Where is semen made?
Semen consists of the secretions of several glands but only 5 per cent comes from the testicles.
Where semen is made
Contributing gland Percentage of whole ejaculate
Testicles and epididymes 5 per cent
Seminal vesicles 46 to 80 per cent
Prostate gland 13 to 33 per cent
Bulbourethral and urethral glands 2 to 5 per cent
Testicles and epididymes
The spermatozoa take over 70 days to develop and are produced solely in the testicles. Individual sperm develop within the testicles from a cell called a spermatogonium.
The spermatogonium divides to produce spermatocytes, which then develop into spermatids. The spermatid develops its familiar tail and the cell gradually acquires the ability to move by beating its tail.
The spermatid eventually develops into a mature spermatozoan. This process takes about 60 days and the sperm then takes a further 10 to 14 days to pass through the ducts of each testicle and its sperm-maturing tube, the epididymis, before it can leave the body in the semen, during ejaculation.
The fluid produced by the testicles contains several chemicals, but is particularly rich in testosterone.
Seminal vesicles
The seminal vesicles usually contribute more than half of the seminal volume. Their secretions are particularly rich in a sugar called fructose, which is an essential nutrient for the spermatozoa. They also produce a substance that causes the semen to clot (become sticky or jelly-like) after ejaculation, thought useful in reproduction for keeping the semen at the neck of a woman's womb.
Prostate gland
The secretions of the prostate gland contain several chemicals, of which prostate specific antigen (PSA) is probably the most interesting. PSA is an enzyme, a catalyst that causes biochemical reactions, in this case a type of enzyme called a coagulase. The prime function of PSA is to liquefy the clotted semen, so that the spermatozoa can escape from it and swim off to fertilise the ovum (egg) in the woman's reproductive tract.
Prostate gland cells produce PSA and some of it leaks into the blood stream, as well as appearing in semen. The bigger and more active the prostate gland is, the more PSA appears in the blood. Men with big, benign (non-cancerous) prostate glands often have higher blood levels of PSA than average. Men with prostate cancer may have very high levels. However, PSA levels can also be normal in both conditions. It is a useful marker of prostate gland size and activity, but is not a specific test for prostate cancer.
Bulbourethral and urethral glands
The secretions of these glands lubricate the male reproductive tract, but they may also contain antibodies that can affect fertility. These anti-sperm antibodies can prevent the spermatozoa moving properly and prevent them from fertilising the ovum (egg).
COME ON
FRENULUM.- A frenulum (or frenum, plural: frenula or frena, from the Latin frēnulum, "little bridle", the diminutive of frēnum ) is a small fold of tissue that secures or restricts the motion of a mobile organ in the body.
In human anatomy
Frenula on the human body include several in the mouth, some in the digestive tract, and some connected to the external genitalia.
Oral tissue: Frenula of the mouth include the frenulum linguae under the tongue, the frenulum labii superioris inside the upper lip, the frenulum labii inferioris inside the lower lip, and the buccal frena which connect the cheeks to the gum. These can easily be torn by violent blows to the face or mouth, thus a torn frenulum is sometimes a warning sign of physical abuse.
Vulvular tissue: In females, genital frenula include the frenulum clitoridis of the clitoris and the frenulum labiorum pudendi (aka fourchette) where the labia minora meet at the back.
Penile tissue: The word frenulum on its own is often used for the frenulum of prepuce of penis or frenulum preputii penis, which is an elastic band of tissue under the glans penis that connects to the prepuce, or foreskin to the vernal mucosa, and helps contract the prepuce over the glans.
Brain: Frenulum veli
An overly short oral or genital frenulum may require a frenectomy or frenuloplasty to achieve normal mobility.
In entomology
The word frenulum also refers to a bristle present at the root of the hindwing of most moths which engages with a small hook on the forewing to join the wings together.
In human anatomy
Frenula on the human body include several in the mouth, some in the digestive tract, and some connected to the external genitalia.
Oral tissue: Frenula of the mouth include the frenulum linguae under the tongue, the frenulum labii superioris inside the upper lip, the frenulum labii inferioris inside the lower lip, and the buccal frena which connect the cheeks to the gum. These can easily be torn by violent blows to the face or mouth, thus a torn frenulum is sometimes a warning sign of physical abuse.
Vulvular tissue: In females, genital frenula include the frenulum clitoridis of the clitoris and the frenulum labiorum pudendi (aka fourchette) where the labia minora meet at the back.
Penile tissue: The word frenulum on its own is often used for the frenulum of prepuce of penis or frenulum preputii penis, which is an elastic band of tissue under the glans penis that connects to the prepuce, or foreskin to the vernal mucosa, and helps contract the prepuce over the glans.
Brain: Frenulum veli
An overly short oral or genital frenulum may require a frenectomy or frenuloplasty to achieve normal mobility.
In entomology
The word frenulum also refers to a bristle present at the root of the hindwing of most moths which engages with a small hook on the forewing to join the wings together.
HIS BODY...
Reproductive system
Main article: Reproductive system
Human reproduction takes place as internal fertilization by sexual intercourse. During this process, the erect penis of the male is inserted into the female's vagina until the male ejaculates semen, which contains sperm, into the female's vagina. The sperm then travels through the vagina and cervix into the uterus or fallopian tubes for fertilization of the ovum.
The pelvic region of a male that contribute towards the reproductive process. The primary direct function of the male reproductive system is to provide the male gamete or spermatozoa for fertilization of the ovum.
The major reproductive organs of the male can be grouped into three categories. The first category is sperm production and storage. Production takes place in the testes which are housed in the temperature regulating scrotum, immature sperm then travel to the epididymis for development and storage. The second category are the ejaculatory fluid producing glands which include the seminal vesicles, prostate, and the vas deferens. The final category are those used for copulation, and deposition of the spermatozoa (sperm) within the female, these include the penis, urethra, vas deferens and Cowper's gland.
Main article: Reproductive system
Human reproduction takes place as internal fertilization by sexual intercourse. During this process, the erect penis of the male is inserted into the female's vagina until the male ejaculates semen, which contains sperm, into the female's vagina. The sperm then travels through the vagina and cervix into the uterus or fallopian tubes for fertilization of the ovum.
The pelvic region of a male that contribute towards the reproductive process. The primary direct function of the male reproductive system is to provide the male gamete or spermatozoa for fertilization of the ovum.
The major reproductive organs of the male can be grouped into three categories. The first category is sperm production and storage. Production takes place in the testes which are housed in the temperature regulating scrotum, immature sperm then travel to the epididymis for development and storage. The second category are the ejaculatory fluid producing glands which include the seminal vesicles, prostate, and the vas deferens. The final category are those used for copulation, and deposition of the spermatozoa (sperm) within the female, these include the penis, urethra, vas deferens and Cowper's gland.
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