1 Male Reproductive System Has many structures and

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Male Reproductive System Has many structures and functions – main function of system is to provide sperm for reproductive purposes – structures go through many changes during puberty 2

The Male Anatomy Includes: – testis • produces sperm – sperm and other ejaculatory fluids together are called semen 3

The Male Anatomy Includes: – pituitary gland • secretes hormone testosterone, which causes production of sperm 4

The Male Anatomy Includes: – scrotum • skin-like pouch made of skin and muscles which holds testes • acts as a protection and temperature regulator 5

The Male Anatomy Includes: – epididymis • one attached to each testicle • provides for storage, transmission and maturation of sperm 6

The Male Anatomy Includes: – vas deferens • serve as excretory ducts for testes • connects epididymis and urethra 7

The Male Anatomy Includes: – urethra • passageway for eliminating urine and semen 8

The Male Anatomy Includes: – seminal vesicles • secretes fluids, which nourish sperm and increase mobility – fluid make up part of the semen 9

The Male Anatomy Includes: – prostate gland • secretes milky alkaline fluid into semen increasing mobility of sperm 10

The Male Anatomy Includes: – penis • made of muscle, spongy tissue and blood vessels • contains urethra • discharges urine and semen from body 11

Puberty • Is the period of time when sexual characteristics develop and sexual organs mature • Is caused by the brain releasing a special hormone called the gonadotropin-releasing hormone – when hormone reaches pituitary gland, gland releases two more puberty hormones: – luteinizing hormone – follicle-stimulating hormone 12

Luteinizing & Follicle-Stimulating Hormones • Stimulate secretion of sex steroids from gonads or testes – starts synthesizing and secreting testosterone • Are critical for sperm production and maturation A boy will make 12 TRILLION sperm in his lifetime. Sperm takes about 72 days to mature. 13

Luteinizing & Follicle-Stimulating Hormones • Are secreted from the pituitary gland signal testes to begin producing sperm and testosterone – testosterone causes development of secondary sex characteristics in males Secondary sex characteristics are visible physical changes to the body during puberty. 14

Puberty • Occurs between ages of 9 and 16 • Causes changes which occur gradually or very rapidly – will see greatest amount of growth during adolescence – will experience many growth spurts and puberty changes 15

Adolescence • Is the period of development which occurs around the age 11 – adolescents face growth spurts and puberty changes 16

Emotional Changes • Occur during puberty such as the following: – desire to control own life and be independent – emotions and feelings are stronger than before – desire for relationships increases – mood changes • bad temper 17

Physical Changes • Which occur include: – enlargement of testicles • first change usually seen in males – penis enlargement • begins about one year after testicles begin growing, at approximately age 13, and continues to grow for nearly two years – more muscular and angular shape to body features • testosterone causes increase in muscle mass 18

Physical Changes • Which occur include: – weight • increases by 15 to 65 lbs. – height • increases by four to 12 in. It may seem like your feet, hands, arms and legs are growing faster than the rest of your body. 19

Physical Changes • Which occur include: – swelling in boys’ chest area • caused by increase in hormones in body during puberty This is normal, but if it causes concern, talk to a doctor. 20

Physical Changes • Which occur include: – oil glands become more active during puberty • causes acne Acne usually begins around the start of puberty and lasts throughout the teen years. 21

Acne • Is a skin condition appearing as bumps • Is caused by the oil glands’ increased production of oil during puberty • Includes four types: If you are – whitehead – blackhead – pimple – cyst bothered by acne, you can visit your doctor to receive a prescription. 22

Physical Changes • Which occur include: – hair growth • begins to grow on body between ages 12 and 14 – due to puberty, will occur on the following areas: • • • face arms and underarms chest legs around the genitals buttocks 23

Facial Hair • Once developed, will require shaving – frequency of shaving will depend on amount of hair grown 24

Voice Changes • Will occur during puberty • Are triggered by testosterone – testosterone causes larynx, voice box and vocal cords to grow • Are dependent upon how large a boy’s larynx grows – size of larynx determines how deep voice will be – as the larynx grows, it pushes Adam’s apple forward 25

Cracks & Squeaks in Voice • Are common when larynx is growing and voice is changing • Can happen at any time • Are perfectly normal Do not be embarrassed if your voice cracks. This is very normal. Remember, this happens to all boys. 26

Puberty • In relation to reproduction, is the transition period where males become able to reproduce An erection is when the penis is filled with blood, making it hard and erect. 27

Erections • Occur when penis is filled with blood, making it hard and erect • Occur more frequently during puberty – occasional and spontaneous erections occur throughout life for males • Can occur with or without sexual stimulation Remember, this is a natural part of growing up. This is nothing to be embarrassed about. 28

Sperm • Begins being produced in male during puberty • Is male reproductive cell • Is produced in testes through a process called spermatogenesis • Is composed of a head, midpiece and tail 29

Spermatogenesis • Is process by which sperm cells are produced 30

Semen • Is composed of sperm and other bodily fluids • May be released during an erection – this is known as ejaculation • when semen is ejaculated into an ovulating female, conception and pregnancy can occur 31

Stop here Mrs. Mc. Cann 32