CHAPTER 19: REPRODUCTIVE SYSTEMS 19.1 INTRODUCTION Produce and nurture sex cells.
THE REPRODUCTIVE SYSTEM Organs & glands that: 1. produce & nurture sex cells; 2. transport these...
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Transcript of THE REPRODUCTIVE SYSTEM Organs & glands that: 1. produce & nurture sex cells; 2. transport these...
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THE REPRODUCTIVE SYSTEM
Organs & glands that: 1. produce & nurture sex cells; 2. transport these cells to site of fertilization; 3. ensure production of offspring with correct # of chromosomes
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THE MALE REPRODUCTIVE SYSTEM
• Produce & nurture sperm cells & transport them to site of fertilization
• The male gonads are the TESTES
• ~ 5 cm long• Produce sperm
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OTHER ORGANS• SCROTUM:
pouch that holds testicles; outside body to keep sperm @ lower temp
• SEMINIFEROUS TUBULES: tightly coiled tubes w/i testicles; where sperm are made
• EPIDIDYMIS: pouch that sits on testes; stores sperm while they mature
• VAS DEFERENS: duct leading from epididymis to urethra; transport sperm
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GLANDS
• SEMINAL VESICLE: convoluted sac behind urinary bladder; secretes alkaline substances, fructose, prostaglandins
• PROSTATE GLAND: chestnut shaped;
just below bladder; secretes thin milky alkaline substance
• COWPER’S GLAND:
just below prostate; secretes a mucous lubricating fluid
Together these secretions form SEMEN…~7.5 pH
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ON THE WAY OUT…
• URETHRA: tube leading to outside of male’s body (part of urinary tract, but there is a flap that closes opening to bladder during ejaculation
• PENIS: used to deposit sperm into female’s body
• PREPUCE: foreskin…loose skin…removed during circumcision
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SPERM• Males produce
sperm throughout reproductive cycle
• Mobile & small compared to egg
• Spermatogenesis: formation of sperm cells (meiosis)
• Erection: erectile tissue…fills with blood (in penis)
• Ejaculation: forceful muscular release of sperm
Contain enzymes To penetrate egg
Contain mitochondriaFor energy
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MALE HORMONES
• Called androgens• Produced in testes; controlled by
hypothalamus & pituitary glands• PUBERTY: release of hormones
makes a male reproductively functional
• The main male hormone is TESTOSTERONE
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FUNCTIONS OF TESTOSTERONE
• Stimulate enlargement of reproductive organs & develop male characteristics…
• Increased growth of body hair• Enlargement of larynx; thickening of vocal
cords • Thickening of skin• Thickening/strengthening of bones• Increased red blood cell production• Affects sexual regions of brain• Increased muscular growth; narrowing of
waist; broadening of shoulders
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FEMALE REPRODUCTIVE SYSTEM
• Produce & maintain egg cells;
• transport egg to site of fertilization
• Provide favorable environment for fetal development
• The female gonad is the OVARIES
• Solid, oval, ~3.5 cm• Produce eggs
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FEMALE ORGANS
• FALLOPIAN TUBES: (also called oviducts): ~ 10 cm; funnel shape near ovary (infundibulum); transports egg to uterus; fertilization takes place here!
• UTERUS: hollow, muscular, pear shaped; bends forward over bladder; attachment for fertilized egg; fills with blood/nutrients; embryo/fetus develops here(expands to 500X normal size during pregnancy)
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• CERVIX: neck of uterus
• VAGINA: ~ 9 cm long tube leading to outside of body; releases uterine secretions; receives penis; birth canal
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EXTERNAL FEATURES• LABIA MAJORA rounded folds of fat tissue;
enclose/protect external reproductive organs (corresponds to male scrotum)
• LABIA MINORA flattened folds w/i labia majora
• CLITORIS small projection; most concentrated area of nerve fibers anywhere in body (8000)…corresponds to the male penis
• VESTIBULE small space…vagina opens at posterior end…urethra opens at mid-section
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EVENTS
• OOGENESIS: formation of egg cells (during meiosis)
• OVULATION: release of egg from ovary to fallopian tube
• ORGASM: series of reflexes & rhythmic contractions that make it easier for sperm to move
• PUBERTY: the reproductive system becomes active
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• MENSTRUATION: release of blood that has built up in uterus & unfertilized egg
• MENOPAUSE: end of female fertility; menstruation stops; caused by aging of ovaries & reduced estrogen production
• FERTILIZATION: union of sperm & egg
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FEMALE HORMONES
• ESTROGEN• Stimulate
enlargement of reproductive organs
• Breast development• Increased fat
production• Increased
vascularization of skin
• PROGESTERONE
• Changes in uterus during reproduction
• Affect mammary glands
• Secretion of FSH & LH
Controlled by the hypothalmus
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THE MENSTRUAL CYCLE• FOLLICLE STIMULATING HORMONE
(FSH) stimulates production of follicle around egg
• ESTROGEN stimulates production of LH
• LUTEINIZING HORMONE (LH) stimulates egg to mature
• LUTEOTROPHIC HORMONE (LTH) stimulates production of progesterone
• PROGESTERONE stimulates thickening of uterine lining; stops production of FSH
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MAMMARY GLANDS
• Accessory organs• Produce &
secrete milk after birth
• 15-20 lobes • Dense connective
& adipose tissue separate each lobe
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How the Egg is Deceived
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