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Our Reproductive Systems

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Presentation on theme: "Our Reproductive Systems"— Presentation transcript:

1 Our Reproductive Systems
Male and Female

2 About Human Reproduction
All living things reproduce Reproduction - the process by which organisms make more organisms like themselves Two kinds of sex cells (gametes) are involved: Male gamete  sperm Female gamete  egg (ovum) The sperm and the egg must meet to create a new individual

3 About Human Reproduction
Both the male and female reproductive systems are essential for reproduction Humans pass certain characteristics of themselves to the next generation through their genes, the special carriers of human traits The genes that parents pass along are what make their children similar to others in their family, but also what make each child unique Genes come from the male's sperm and the female's egg

4 About Human Reproduction
Most species have two sexes: male and female Each sex has its own unique reproductive system Different in shape and structure But both are specifically designed to produce, nourish, and transport either the egg or sperm

5 The Female Reproductive System

6 The Female Reproductive System
Unlike the male, the human female has a reproductive system located entirely inside the pelvis

7 Vulva The external part of the female reproductive organs
Means “covering” Located between the legs, the vulva covers the opening to the vagina and other reproductive organs located inside the body

8 Vulva Vulva

9 Mons Pubis The fleshy area located just above the top of the vaginal opening Pubic hair forms here

10 Labia Two pairs of skin flaps that surround the vaginal opening
Pubic hair forms here

11 Clitoris A small sensory organ that is located toward the front of the vulva where the folds of the labia join

12 Urethra Canal that carries urine from the bladder to outside the body
Located between the labia

13 Female Reproductive Organs
Vagina Uterus Fallopian Tubes Ovaries

14 Vagina A muscular, hollow tube that extends from the vaginal opening to the uterus About 3 to 5 inches long in a grown woman It has muscular walls so it can expand and contract This ability to become wider or narrower allows the vagina to accommodate something as slim as a tampon and as wide as a baby The vagina's muscular walls are lined with mucous membranes, which keep it protected and moist

15 Vagina Vagina

16 The Vagina Serves Three Purposes
It's where the penis is inserted during sexual intercourse It's the pathway that a baby takes out of a woman's body during childbirth, called the birth canal It provides the route for the menstrual blood (the period) to leave the body from the uterus

17 Hymen A thin sheet of tissue with one or more holes in it that covers the opening of the vagina Often different from female to female

18 Cervix Where the vagina connects with the uterus Means “neck”
The opening of the cervix is very small (no wider than a straw), which is why a tampon can never get lost inside a girl's body During childbirth, the cervix can expand to allow a baby to pass

19 Cervix Cervix

20 Uterus Shaped like an upside-down pear
Has a thick lining and muscular walls Some of the strongest muscles in the female body These muscles are able to expand and contract to accommodate a growing fetus and then help push the baby out during labor

21 Uterus Uterus Uterine Cavity

22 Fallopian Tubes There are 2, each attached to a side of the uterus
Connect the uterus to the ovaries About 4 inches long and about as wide as a piece of spaghetti Within each tube is a tiny passageway no wider than a sewing needle When an egg pops out of an ovary, it enters the fallopian tube Once the egg is in the fallopian tube, tiny hairs in the tube's lining help push it down the narrow passageway toward the uterus.

23 Fallopian Tubes Fallopian Tubes

24 Ovaries Two oval-shaped organs that lie to the upper right and left of the uterus They produce, store, and release eggs into the fallopian tubes in the process called ovulation Each ovary measures about 1½ to 2 inches in a grown woman Part of the endocrine system Produce estrogen and progesterone

25 Ovaries Ovaries

26 The Female Reproductive System Enables A Woman To:
Produce eggs (ova) Have sexual intercourse Protect and nourish the fertilized egg until it is fully developed Give birth

27 Gonads Sexual reproduction could not happen without the gonads
Both sexes have gonads! Males  testicles Females  ovaries The female gonads produce female gametes Eggs The male gonads produce male gametes Sperm After an egg is fertilized by the sperm, the fertilized egg is called the zygote

28 Females During Puberty
When a baby girl is born, her ovaries contain hundreds of thousands of eggs, which remain inactive until puberty begins At puberty, the pituitary gland, starts making hormones that stimulate the ovaries to produce female sex hormones, including estrogen The secretion of these hormones causes a girl to develop into a sexually mature woman

29 Menstruation Toward the end of puberty, girls begin to release eggs as part of a monthly period called the menstrual cycle Approximately once a month, during ovulation, an ovary sends a tiny egg into one of the fallopian tubes Unless the egg is fertilized by a sperm while in the fallopian tube, the egg dries up and leaves the body about 2 weeks later through the uterus — this is menstruation Blood and tissues from the inner lining of the uterus combine to form the menstrual flow Usually lasts from 3 to 5 days

30 Premenstrual Syndrome (PMS)
Females experience discomfort in the days leading to their periods – this is common! PMS includes both physical and emotional symptoms that many females get right before their periods, including: Acne Food cravings Bloating Depression Fatigue Irritability Backaches Difficulty concentrating or handling stress Sore breasts Headaches Constipation Diarrhea

31 PMS PMS is usually at its worst during the 7 days before a girl's period starts and disappears once it begins Many females also experience abdominal cramps during the first few days of their periods These are caused by prostaglandins Chemicals in the body that make the muscle in the uterus contract Involuntary contractions Can be dull or sharp and intense

32 Menstrual Cycle It can take up to 2 years from menarche (a females first period) for a girl's body to develop a regular menstrual cycle During that time, her body is adjusting to the hormones puberty brings On average, the monthly cycle for an adult woman is 28 days, but the range is from 23 to 35 days


34 Problems of the Female Reproductive System

35 Problems of the Vulva & Vagina
Vulvovaginitis Inflammation of the vulva and vagina Caused by irritating substances or poor personal hygiene Nonmenstrual vaginal bleeding The presence of a foreign body A straddle injury Vaginal trauma from sexual abuse Labial adhesions The sticking together of the labia Increased risk of UTI

36 Problems of the Ovaries and Fallopian Tubes
Ectopic pregnancy when a fertilized egg doesn't travel into the uterus but instead grows rapidly in the fallopian tube Endometriosis when tissue normally found only in the uterus starts to grow outside the uterus Ovarian tumors Ovarian cysts noncancerous sacs filled with fluid or semisolid material; are common and generally harmless unless they grow large Polycystic ovary syndrome a hormone disorder in which too many male hormones (androgens) are produced by the ovaries Ovarian torsion the twisting of the ovary, can occur when an ovary becomes twisted because of a disease or a developmental abnormality

37 Menstrual Problems Dysmenorrhea Menorrhagia Oligomenorrhea Amenorrhea
painful periods Menorrhagia very heavy periods with excess bleeding Oligomenorrhea when a female misses or has infrequent periods, even though she's been menstruating for a while and isn't pregnant Amenorrhea when a female has not started her period by the time she is 16 years old or 3 years after starting puberty; has not developed signs of puberty by age 14; has had normal periods but has stopped menstruating for some reason other than pregnancy

38 Infections of the Female Reproductive System
Sexually Transmitted Infections (STIs) Infections and diseases of the reproductive system Most are spread from one person to another by sexual contact Toxic Shock Syndrome Uncommon illness caused by toxins released into the body during a type of bacterial infection that is more likely to develop if a tampon is left in too long Can produce high fever, diarrhea, vomiting, and shock

39 The Male Reproductive System

40 The Male Reproductive System
Unlike the female, whose sex organs are located entirely within the pelvis, the male has reproductive organs, or genitals, that are both inside and outside the pelvis

41 The Male Genitals The testicles
The duct system, which is made up of the epididymis and the vas deferens The accessory glands, which include the seminal vesicles and prostate gland The penis

42 Testicles / Testes In a male who has reached sexual maturity, the two testicles, or testes, produce and store millions of tiny sperm cells The testicles are oval-shaped and grow to be about 2 inches in length and 1 inch in diameter The testicles are also part of the endocrine system because they produce hormones, including testosterone Testosterone is the hormone that causes boys to develop deeper voices, bigger muscles, and body and facial hair, and it also stimulates the production of sperm

43 Testes / Testicles Testes

44 Vas Deferens A muscular tube that passes upward alongside the testicles and transports the sperm-containing fluid called semen

45 Vas Deferens Vas Deferens

46 Epididymis A set of coiled tubes (one for each testicle) that connects to the vas deferens Sperm is stored here

47 Epididymis Epididymis

48 Scrotum A sac-like pouch that holds the testes and epididymis
This pouch helps to regulate the temperature of the testes, which need to be kept cooler than body temperature to produce sperm Changes size to maintain the right temperature Cold – shrinks and becomes tighter to hold in body heat Warm – becomes larger and more floppy to get rid of extra heat Happens unconsciously The brain and the nervous system give the scrotum the cue to change size

49 Scrotum Scrotum

50 Seminal Vesicles Sac-like structures attached to the vas deferens to the side of the bladder Provide fluids that lubricate the duct system and nourish the sperm

51 Seminal Vesicles Seminal Vesicles

52 Prostate Gland Surrounds the ejaculatory ducts at the base of the urethra, just below the bladder Provide fluids that lubricate the duct system and nourish the sperm

53 Prostate Gland Prostate Gland

54 Urethra The channel that carries the semen to the outside of the body through the penis 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

55 Urethra Urethra

56 Penis Made up of 2 parts: Shaft – main part of the penis Glans – tip At the end of the glans is a small opening, which 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

57 Penis Shaft Glans

58 Puberty During the first stage of male puberty, the scrotum and testes grow larger Next, the penis becomes longer, and the seminal vesicles and prostate gland grow Hair begins to appear in the pubic area and later it grows on the face and underarms. During this time, a male's voice also deepens. Boys also undergo a growth spurt during puberty as they reach their adult height and weight.

59 Sperm A male who has reached puberty will produce millions of sperm cells every day Extremely small – 1/1600 of an inch Develop in the testicles within a system of tiny tubes called the seminiferous tubules Each sperm contains a head and a small tail The head contains the genetic material They use their tails to push themselves into the epididymis where they complete development It takes sperm about 4 to 6 weeks to travel through the epididymis

60 Sperm

61 Sperm & The Penis Next, the sperm goes to the vas deferens, or sperm duct. The seminal vesicles and prostate gland produce a whitish fluid called seminal fluid, which 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)

62 Sperm & The Penis The erect penis makes it easier to insert into the female's vagina during sexual 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 male ejaculates, it can contain up to 500 million sperm

63 Sperm & The Penis

64 Conception 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 fertilization, or conception, occurs

65 Conception This fertilized egg is now called a zygote 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 female's uterus, maturing over the course of the pregnancy into an embryo, a fetus, and finally a newborn baby

66 Things That Can Go Wrong With The Male Reproductive System

67 Disorders of the Scrotum, Testicles, or Epididymis
Testicular trauma Occurs when the testicles are struck, hit, or crushed Can cause severe pain, bruising, and/or swelling Testicular cancer One of the most common forms of cancer in men under 40  Occurs when cells in the testicle divide abnormally and form a tumor Epididymitis  Inflammation of the epididymis, caused by an infection Inguinal Hernia When a portion of the intestines pushes through an abnormal opening or weakening of the abdominal wall and into the groin or scrotum

68 Disorders of the Penis Inflammation of the penis Hypospadias
Occurs when the glans becomes inflamed Symptoms include redness, itching, swelling, and pain Hypospadias When the urethra opens on the underside of the penis, not at the tip Ambiguous genitalia occurs when a child is born with genitals that aren't clearly male or female In most boys born with this disorder, the penis may be very small or nonexistent, but testicular tissue is present

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