reproductive system
DESCRIPTION
Reproductive System. P&A. I. Intro. A. Structures 1. testes, ovaries, and external organs A. many accessory organs involved as well: Uterus, fallopian tubes, vas deferens, epididymus B. Function 1. produce sex cells 2. transport sex cells - PowerPoint PPT PresentationTRANSCRIPT
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P&A
REPRODUCTIVE SYSTEM
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I. INTRO
A. Structures
1. testes, ovaries, and external organs A. many accessory organs involved as well:
Uterus, fallopian tubes, vas deferens, epididymus
B. Function
1. produce sex cells
2. transport sex cells
3. produce & secrete hormones which develop and maintain male and female sex characteristics
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II. MALE REPRODUCTIVE ORGANS
A. Main function: to produce sperm
B. Testes
1. 2 ovoid/oval structures found within cavities called SCROTUM
2. Each teste is separated into 250 lobules A. each lobule contains SEMINIFEROUS TUBULES
B. ST contain SPERMATOGENIC CELLS Def: cells that give rise to sperm
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C. spermatogenic cells remain inactive until adolescence when they undergo MEIOSIS Def: process of cell division that results in ½ the
amount of chromosomes than the parent cell
Parent cell = 46
Sperm cell = 23 to later combine with egg’s 23
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C. Male Internal Accessory Organs 1. Epididymus
S: tightly coiled 6 m. long tube that connects to vas deferens
F: passageway for sperm
2. Vas Deferens S: muscular tube 45 cm. long
Passes along testes, through abdominal cavity, end behind urinary bladder
F: passageway for sperm to urethra
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3. Seminal Vesicle S: Saclike structure attached to vas deferens below
urinary bladder
F: secrete fluid that allows for correct pH for sperm to live and sugary substance to energize sperm
4. prostate gland S: chestnut shaped structure surrounding anterior
urethra
F: secrete fluid to help neutralize sperm-cell fluid
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5. Semen S: fluid conveyed through male urethra to the
outside of the body via the urethra
1) made of:
Sperm cells from testes
Fluids from seminal vesicle
Fluids from prostate gland
2) 2-6 ml are released at one time
120 million/ml sperm are released
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D. Male External Reproductive Organs
1. scrotum A. pouch of skin that holds testes
B. Why? So testes are outside of the body to maintain the correct
temperature for sperm to live and grow
Too hot inside the body
2. penis A. cylindrical organ that houses urethra
B. conveys urine & semen to outside of body
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III. HORMONAL CONTROL OF MALE REPRODUCTIVE SYSTEM
A. follicle stimulating hormone – FSH
1. FSH – secreted by anterior pituitary gland
2. stimulate spermatogenic cells to produce sperm
B. Testosterone
1. secreted by testes
2. also stimulates spermatogenic cells to produce sperm
3. secretion is very low until age 13-15
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4. Effects: Increased body hair on chest, arm pits, face, pubic
region
Enlargement of larynx
Thicker vocal cords = lower voice
Thicker skin
Increase muscular growth
Broaden shoulders
Narrow waist
Thicker bones
Sperm cells divide and become active
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IV. FEMALE REPRODUCTIVE ORGANS
A. Main Function: to produce eggs
B. Ovaries
1. 2 ovoid structures located in shallow depression of pelvic wall
2. s: two regions: Outer cortex
Inner medulla
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3. before birth ovaries form several million PRIMORDIAL FOLLICLES A. def: cells that develop into eggs by undergoing
meiosis
B. only 1 million remain at birth 400,000 remain at puberty
Fewer than 1,000 are released during female’s lifetime
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4. primordial follicles develop and the OOCYTE (egg cell) inside eventually ruptures out and travels to fallopian/uterine tube Process is call OVULATION
If oocyte isn’t fertilized by sperm it degenerates
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V. FEMALE ACCESSORY ORGRANS
A. Uterine/fallopian tubes
S: 10 cm long tubes from ovary to uterus Wall is full of ciliated simple columnar epithelium
to move egg
F: secrete mucous and move cilia to pass egg along tube
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B. uterus
1. S: inverted pear shaped Hollow
Muscular
Lower 1/3 called cervix
3 layered wall Endometrium: inner layer
Myometrium: middle muscular layer
Perimetrium: outer covering
F: to hold growing fetus
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C. Vagina
1.S: 9 cm long tube from uterus to outside
F: Conveys uterine secretions to outside
Receives penis during sexual intercouse
Transports child during birth
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D. labia major
1. S: flaps of tissue seperated longitudinally by a cleft
2. F: to enclose and protect other female reproductive organs
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VI. HORMONAL CONTROL OF FEMALE REPRODUCTIVE SYSTEM
* release at about 8 yrs old
A. F:
Develop and maintain female sexual characteristics
Maturation of egg cells
Regulate monthly menstrual cycle
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B. FSH & Leutinizing Hormone (LH)
1. secreted by APG
2. control production of sex hormones and egg cells maturation
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C. Estrogen & progesterone
1. estrogen A. produced by ovaries
B. controls: Enlargement of accessory organs
Development of breasts and mammary glands
Increase adipose tissue breasts, thighs, and buttocks
Increase vessels to skin
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2. progesterone A. produced by ovaries
B. controls uterus changes during menstrual cycle
D. Androgens (male hormones)
1. cause female at puberty to grow hair in arm pits and pubic region
2. the low concentrations cause females to have narrow shoulders and broad hips
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VII. FEMALE MENSTRUAL CYCLE
A. DEF:
1. approximate 28 -32 day cycle in which regular changes happen to the uterine wall Usually begins at approx age 13
Culminates in external bleeding
B. hormone involvement
1. FSH & LH cause maturation of egg cells
2. egg cells produce estrogen and progesterone F: responsible to continuing and maintaining female
reproductive system
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C. week 1
1. increased estrogen causes endometrium to thicken
D. day 11-14
1. LH causes follicular wall to rupture and egg released = ovulation
* time when woman is most likely to get pregnant
2. follicle without the egg becomes the CORPUS LUTEUM
3. if the egg is not fertilized the CL has no function
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E. day 24
If CL has no function, the uterine blood vessels constrict, decreases O2 to uterus
Therefore, uterine lining disintegrates as blood capillaries release blood
F. Day 28-32
1. blood flows out of vaniga
2. lasts approx 3-5 days
3. CL and egg are flushed out
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VIII. MAMMARY GLANDS
A. located in subcutaneous tissue of breasts
B. f: secrete milk following pregnancy
C. S: composed of 15-20 lobes with ALVEOLAR DUCTS that lead to the outside