All living things reproduce. Reproduction — the process by which organisms make more organisms like themselves — is one of the things that set living things apart from nonliving matter. But even though the reproductive system is essential to keeping a species alive, unlike other body systems it's not essential to keeping Sexual reproduction in man individual alive. In the human reproductive process, two kinds of sex cellsor gametes pronounced: GAH-meetzare involved.
The male gamete, or spermand the female gamete, the egg or ovummeet in the female's reproductive system to create a new individual. Both the male and female reproductive systems are essential for reproduction. Humans, like other organisms, pass certain "Sexual reproduction in man" of themselves to the next generation through their genesthe special carriers of human traits. The genes parents pass along to their children are what make children similar to others in their family, but they are also what make each child unique.
These genes come from the father's sperm and the mother's egg, which are produced by the male and female reproductive systems. Most species have two sexes: Each sex has its own unique reproductive system.
They are different in shape and structure, but both are specifically designed to produce, nourish, and transport either the egg or sperm. Unlike the female, whose sex organs are located entirely within the pelvis, the male has reproductive organs, or Sexual reproduction in manthat are both inside and outside the pelvis. The male genitals include:. In a guy who's reached sexual maturity, the two testicles pronounced: TESS-tih-kulzor testes pronounced: TESS-teezproduce and store millions of tiny sperm cells.
The testicles are oval-shaped and grow to be about 2 inches 5 centimeters in length and 1 inch 3 centimeters in diameter. The testicles are also part of the endocrine system because they produce hormones, including testosterone pronounced: Testosterone is a major part of puberty in guys, and as a guy makes his way through puberty, his testicles produce more and more of it. Testosterone is the hormone that causes guys to develop deeper voices, bigger muscles, and body and facial hair, and it
Sexual reproduction in man stimulates the production of sperm.
Alongside the testicles are the epididymis pronounced: The vas deferens is a muscular tube that passes upward alongside the testicles and transports the sperm-containing fluid called semen pronounced: The epididymis is a set of coiled tubes one for each testicle that connects to the vas deferens.
The epididymis and the testicles hang in a pouch-like structure outside the pelvis called the scrotum. This bag of skin helps to regulate the temperature of testicles, which need to be kept cooler than body temperature to produce sperm.
The "Sexual reproduction in man" changes size to maintain the right temperature.
When the body is cold, the scrotum shrinks and becomes tighter to hold in body heat. When it's warm, the scrotum becomes larger and more floppy to get rid of extra heat. This happens without a guy ever having to think about it.
The brain and the nervous system give the scrotum the cue to change size. The accessory glandsincluding the seminal vesicles "Sexual reproduction in man" the prostate gland, provide fluids that lubricate the duct system and nourish the sperm. The seminal vesicles are sac-like structures attached to the vas deferens to the side of the bladder.
The prostate glandwhich produces some of the parts of semen, surrounds the ejaculatory ducts at the base of the urethra pronounced: The urethra is the channel that carries the semen to the outside of the body through the penis. The urethra is also part of the urinary system because it is also the channel through which urine passes as it leaves the bladder and exits the body.
The penis is made up of two parts: The shaft is the main part of the penis and the glans is the tip sometimes called the head. At "Sexual reproduction in man" end
Sexual reproduction in man the glans is a small slit or opening, which is where semen and urine exit the body through the urethra. The inside of the penis is made of a spongy tissue that can expand and contract. All boys are born with a foreskina fold of skin at the end of the penis covering the glans.
Some boys have a circumcisionwhich means that a doctor or clergy member cuts away the foreskin. Circumcision is usually performed during a baby boy's first few days of life. Although circumcision is not medically necessary, parents who choose to have their children circumcised often do so based on religious beliefs, concerns about hygiene, or cultural or social reasons.
Penises work the same, whether they are circumcised or not. The male sex organs work together to produce and release semen into the reproductive system of the female during sexual intercourse. The male reproductive system also produces sex hormones, which help a boy develop into a sexually mature man during puberty. When a baby boy is born, he has all the parts of his reproductive system in place, but it isn't until puberty that he is able to reproduce.
When puberty begins, usually
Sexual reproduction in man the ages of 9 and 15, the pituitary pronounced: The production of testosterone brings about many physical changes. Although the timing of these changes is different for every guy, the stages of puberty generally follow a set sequence:. Once a guy has reached puberty, he will produce millions of sperm cells every day. Each sperm is extremely small: Sperm develop in the testicles within a system of tiny tubes called the seminiferous tubules pronounced: At birth, these tubules contain simple round cells, but during puberty, testosterone and other hormones cause these cells to transform into sperm cells.
The cells divide and change until they have a head and short tail, like tadpoles. The head contains genetic material genes. The sperm
Sexual reproduction in man their tails to push themselves into the epididymis, where they complete their development. It takes sperm about 4 to 6 weeks to travel through the epididymis.
The sperm Sexual reproduction in man move to the vas deferens, or sperm duct. The seminal vesicles and prostate gland produce Sexual reproduction in man whitish fluid called seminal fluidwhich mixes with sperm to form semen when a male is sexually stimulated. The penis, which usually hangs limp, becomes hard when a male is sexually excited. Tissues in the penis fill with blood and it becomes stiff and erect an erection. The rigidity of the erect penis makes it easier to insert into the female's vagina during Sexual reproduction in man intercourse.
When the erect penis is stimulated, muscles around the reproductive organs contract and force the semen through the duct system and urethra. Semen is pushed out of the male's body through his urethra — this process is called ejaculation. Each time a guy ejaculates, it can contain up to million sperm. When the male ejaculates during intercourse, semen is deposited into the female's vagina.
From the vagina the sperm make their way up through the cervix and move through the uterus with help from uterine contractions. If a mature egg is in one of the female's fallopian tubes, a single sperm may penetrate it, and fertilizationor conceptionoccurs.
This fertilized egg is now called a zygote pronounced: ZY-goat and contains 46 chromosomes — half from the egg and half from the sperm. The genetic material from the male and female has combined so that a new individual can be created. The zygote divides again and again as it grows in the Sexual reproduction in man uterus, maturing over the course of the pregnancy into an embryo, a fetus, and finally a newborn baby.
Guys may sometimes experience reproductive system problems. Below are some examples of disorders that affect the male reproductive system:. Conditions affecting the scrotal contents may involve the testicles, epididymis, or the scrotum itself. If you think you have symptoms of a problem with your reproductive system or if you have questions about your growth and development, talk to your parent or doctor — many problems with the male reproductive system can be treated.
For specific medical advice, diagnoses, and treatment, consult your doctor. More on this topic for: What Are Wet Dreams? The process of reproduction in humans usually relies on sexual intercourse between a male and a female, although there are exceptions to this. Male reproductive system and sperm production /**/ Production of sperm is called spermatogenesis. It takes place in the gonads of the male - the testes. In the human reproductive process, two kinds of sex cells, or gametes ( pronounced: GAH-meetz), are involved.
The male gamete, or sperm, and the female.