Male Reproduction Powerpoint Presentation

January 24, 2018 | Author: Anonymous | Category: Science, Health Science, Urology
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Male Reproductive System

What the Male Reproductive System Does

 Main function is to produce sperm and deliver it to the female reproductive system

How the Male Reproductive System Works

Male Puberty  Starts at around age 12-13  Hormonal changes stimulate an increase in growth rate, alterations in behavior, enlargement of the genitals, and the appearance of secondary sexual characteristics such as facial hair.  Because boys begin their final growth spurt later than girls, they have a longer period of steady growth and usually attain a greater adult height.

Male Puberty  Changes that occur:  Growth spurt occurs  Acne may appear  Larynx enlarges, voice deepens  Facial hair appears  Shoulders broaden  Underarm hair appears  Perspiration increases

 Some breast enlargement may occur  Muscles develop  Pubic hair appears  External genitals enlarge  Sperm production begins  First ejaculation occurs  Long bone growth stops

Sperm  Sex cells that are produced in the testes and are used to fertilize the egg  Sperm swim at the rate of 1-4mm per minute or 60-240mm per hour  50,000 sperm are produced each MINUTE in mature men

Testicles (testes)  Male reproductive organ that makes sperm and testerone  Male begin producing 100+ million sperm a day once they reach puberty

Seminiferous Tubules

 Tightly coiled tubes inside the testes where sperm are made

Testosterone  The male sex hormone that influences sperm production  During puberty, testosterone causes facial and body hair to grow, shoulders to broaden and voice to deepen

Scrotum  The skin covered sac that the testes rest in  Muscles of the scrotum help with temperature control  Sperm develop best several degrees below 98.6

Penis

 The external male reproductive organ that is made up of spongy tissue that has blood flow going through it  The penis removes urine from the bladder and also delivers sperm to the female reproductive system  The glans is the sensitive nerve ending near the tip of the penis

Foreskin  A piece of skin that partially covers the tip of the penis at birth

 Circumcision is the removal of the foreskin from the tip of the penis

Erection  When the penis becomes hard and firm  The blood vessels in the penis fill with blood  The penis must be erect in order for ejaculation to occur

Ejaculation  When sperm are released from the penis  One ejaculation contains 40-300 million sperm  It is normal for a male to ejaculate during sleep, this is called nocturnal emissions or “wet dreams”

Urethra

 Urine passes through the urethra, a tube that starts at the bladder and ends at the opening of the penis  Sperm also pass through the urethra during ejaculation but not at the same time as urine is carried

Epididymis  A tightly coiled tube where sperm mature as they pass through  The epididymis can be up to 700 feet long

Vas Deferens  The next portion of a hollow tube that sperm pass through  The vas deferens can be up to 12 inches long

Vasectomy  The severing and tying off of the vas deferens  Once the vas deferens is severed, sperm will not be able to be ejaculated out of the penis

Seminal Vesicles  Found near the base of the urinary bladder  Produce thick secretions that nourish the sperm and help sperm move easier

Prostate Gland  Encircles the urethra near the bladder  About the size of a walnut  Secretes a thin, milky fluid that protects the sperm from acid in the female reproductive system

Cowper’s Gland  Found near urethra below the prostate  Prior to ejaculation this gland secretes a clear fluid that protects the sperm from acid in the male urethra

Bladder  A triangular sac that stores urine before it is excreted out of the body

Sphincter Valve  A small piece of skin, a muscle that holds back urine or semen so that both do not come out of the body at the same time

Prostate Exam  An examination that is performed to identify any irregularities in the prostate  Exams help in early detection of prostate cancer  Prostate cancer occurs primarily in older males and is the 2nd most common cancer in males in the U.S  For every 3 men diagnosed with cancer this year 1 will have prostate cancer.

Testicular Exam  A self exam that men should perform once per month once they have reached puberty to detect any lumps, swelling, pain, or discomfort in the scrotum or abdomen

Path of Sperm  Testes  Epydidimis  Vas deferens  Prostate Gland  Seminal Vesicle  Sphincter Valve  Urethra  Ejaculated out of Body

Path of Sperm

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