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Transcript of Human Reproductive Systems Our species lives on……. Human Reproduction Part II ...
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Human Reproductive Systems
Our species lives on…….
Human Reproduction Part II
http://www.youtube.com/watch?v=hAgOk3-loUY&feature=related
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MALE REPRODUCTIVE SYSTEM
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Male Sexual DevelopmentTestosterone is the male reproductive hormoneSecreted in small amounts until puberty
Puberty begins when:Hypothalamus Pituitary increased
FSH and LH GONADS (TESTES)GONADS TESTOSTERONE
Testosterone produces male 2ndary sex characteristics (such as body hair, muscle development, deep voice)
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Male Reproductive PartsTestes: Male reproductive gland Sperm and testosterone
produced
Scrotum: Protective sac around testes Keeps testes cool (this keeps
the sperm at an optimum temperature for development
Epididymus: Stores sperm while they
mature
Vas Deferens: Tube that carries sperm from
epididymis to urethra
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Diagram of Testicle
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Male Reproductive PartsProstate gland -- the largest of several glands which add lubricating and other fluids to the sperm Urethra: tube through the penis carrying sperm to
the outside of the bodyOther glands work together to produce seminal fluid. Combination of sperm and seminal fluid =
semen
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2010 Reproduction -SMB
6. penis -- adaptation for internal fertilization of the female
Semen travels from testes →vas deferens→ urethra→ penis → outside of the body through ejaculation (uncontrolled muscle contractions)
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Female Reproductive SystemSide view
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Female Sexual Development
Estrogen and progesterone are the female reproductive hormones
Puberty begins when:Hypothalamus Pituitary increased
FSH AND LH GONADS (OVARIES)GONADS Estrogen and progesterone
Estrogen produces female 2ndary sex characteristics (broadening of pelvis, breast development, and are involved in the menstrual cycle and pregnancy).
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Female Reproductive PartsOvaries: Female Reproductive Gland
(females have two of these) Eggs (ova) produced here Also contain follicles:
Place where eggs mature
Fallopian tubes (Oviduct): Tubes that carry an egg from
ovary to uterus Place of fertilization
Egg Travel: From the ovaries → fallopian tubes/oviducts → uterus
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Uterus: Mostly muscle implantation and
development of the embryo and fetus before birth occurs here
Vagina (or birth canal) entry point for sperm from
the male and exit tube for the baby when it is born
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HUMAN REPRODUCTIVE SYSTEMS Diagrams….
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Fertilization & Development
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Types of Fertilization
External: gametes fuse outside the body of the female Occurs in animals that breed in the water (most
invertebrates- Fish/amphibian) The two parents release their eggs into the water, and
the sperm fertilizes the eggs.
Internal – gametes fuse inside the body of a female Fertilization occurs inside the female body
where it is moist Occurs mostly in animals that reproduce on
land and some aquatic animals like sharks, reptiles, and mammals
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PROS CONS
EXTERNAL Large numbers of eggs and sperm are released to increase chances of survival.
Gametes released at the same time
Sperm may not find the eggs.
Predators may find and eat eggs or small offspring.
Changes in temperature or oxygen content of the water may cause death.
INTERNAL Fewer eggs need to be released.
Hormones and “mating signals” trigger the release of the eggs and sperm. Ex. Singing, special feathers, and pheromones.
Mating must take place within ~ 24 hours for fertilization to occur
COMPARISONCOMPARISON
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DAY 0
When sperm penetrates egg Sperm releases special
enzymes to do this Forms a ZYGOTE Recombination occurs:
Combining of genetic info from both parents
(n=23) (n=23) (2n=46)
Sperm + egg = zygote
Occurs in the oviduct
FERTILIZATION
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Multiple births: fraternal twins- 2 eggs identical twins- one egg that
splits in two, always the samehttp://www.brainpop.com/health/
geneticsgrowthanddevelopment/twins/
Abby & Brittany turn 16
http://www.bing.com/videos/search?q=abby+and+brittany+hensel&mid=78A3B27DF1EF569A364278A3B27DF1EF569A3642&view=detail&FORM=VIRE2&adlt=strict
Abby & Brittany Hensel- Conjoined twins (aka Siamese twins) are identical twins whose bodies are joined in utero.
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FertilizationFertilization
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Occurs in the oviduct Zygote begins a series of mitotic divisions (cleavage) to undergo differentiation Division process is rapid - no increase in size, just the number of cells:
1 cell→ 2 cells→ 4→ 8→ 16→32→64→ 128 …etc
Implantation of zygote in uterus occurs around day 7
Early Development- The First WeekEarly Development- The First Week
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EMBRYONIC DEVELOPMENT
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Embryonic Layers and FunctionsGASTRULATION
Cells in zygote form into 3 distinct layers
The cells within each layer The cells within each layer DIFFERENTIATE DIFFERENTIATE to formto form specialized specialized cellscells (muscle, liver, heart, etc) then (muscle, liver, heart, etc) then tissue and organs. tissue and organs. This is caused by This is caused by gene activationgene activation
which can be influenced by the which can be influenced by the environment.environment.
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EctodermEctoderm MesodermMesoderm EndodermEndoderm
skin and nervou
s system
Muscular, circulatory skeletal, excretory and reproduction systems
lining of digestive and respiratory
tract (body organs)
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These developing cells are now called an embryonic stems cells and can be used as for medical research and application
http://www.brainpop.com/science/cellularlifeandgenetics/stemcells/http://www.pbs.org/wgbh/nova/body/stem-cells-breakthrough.html
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HUMAN FETAL DEVELOPMENT
1. Placenta – Develops at 3 weeksPlacenta is a fetal organConnects mother and fetusFood, gases and wastes DIFFUSE across blood vessels
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2. Umbilical cord- rope-like structure that connects the fetus to the placenta
3. Amnion- membrane surrounding the fetus
4. Amniotic fluid – fills the amnion, protects the fetus, and absorbs shock
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Most critical time of development is the 1st trimester when organs are developing
Harmful environmental risk factors include drugs, rugs, alcoholalcohol tobaccotobacco medicinesmedicines poor dietpoor diet, , toxic substancestoxic substances infections infections
This can halt development or cause major developmental issues
Not taking care can result in miscarriage or can severely damage embryo/fetus
First and Second Trimester Dangers!!!!
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8 weeks = FETUS
Umbilical cord forms at 3 months
Body systems become more specialized
Fetus becomes bigger
BirthBirth (36 weeks (36 weeks)
Later Development
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Human fetal development7 weeks4 weeks
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Human fetal development10 weeks
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Human fetal development
12 weeks 20 weeks
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Human fetal developmentThe fetus just spends much of the 2nd & 3rd trimesters just growing
…and doing various flip-turns & kicks inside amniotic fluid
Week 20
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Human fetal development24 weeks (6 months; 2nd trimester)
fetus is covered with fine, downy hair called lanugo. Its skin is protected by a waxy material called vernix
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Getting crowded in there!!32 weeks (8 months)
The fetus sleeps 90-95% of the day & sometimes experiences REM sleep, an indication of dreaming
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Human fetal development30 weeks (7.5 months)
umbilical cord
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The end of the journey!
And you think 9 months of
Biology is hard!
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The Menstrual and Ovarian CyclesThe Truth behind PMS!!
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Menstrual CycleMenstrual Cycle
Begins at puberty and ends at menopauseTakes about 28 daysRegulated by four hormones: estrogen, progesterone, FSH and LH
MenopauseThe menstrual cycle stops permanently usually between the ages of 45 and 50 although it may occur sooner. The permanent cessation of the cycle is called Menopause.
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Vocabulary- Vocabulary- THE HORMONESTHE HORMONES
A. Secreted by the Pituitary gland: FSH (Follicle Stimulating Hormone)
Stimulates follicle to cause egg to mature LH (Luteinizing Hormone)
Causes release of mature ovum (ovulation)
Prepares uterus for implantation of fertilized egg
B. Secreted by Ovaries: Estrogen
Causes uterine lining to thicken Progesterone:
Works with estrogen to finish uterine lining thickening
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The CyclesThe CyclesA. Ovarian Cycle:
Occurs over 28 days in the ovaries Process during which an ovum matures in
a follicle and is released during ovulation After ovulation, a corpus luteum (yellow
body) is left behind
B. Menstrual (Uterine) Cycle: Occurs over 28 days Process during which uterine lining is
preparing for fertilized ovum If fertilization occurs, this cycle stops
until after birth If not fertilized, lining sheds
(menstruation!) and cycle begins again
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Menstrual Cycle Flow ChartMenstrual Cycle Flow Chart
Menstruation (3-5 days)
•Uterine lining sheds and FSH increases•This causes drop in estrogen and progesterone•Occurs if egg is not fertilized
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Menstrual Cycle Flow ChartMenstrual Cycle Flow ChartFollicle Stage: (10-14 days)
•Low estrogen = FSH to be released (negative feedback)•This stimulates growth of follicle •Follicle (egg) matures causing estrogen levels to go up
•Uterine lining begins to thicken again
Menstruation (3-5 days)
•Uterine lining sheds and FSH increases•This causes drop in estrogen and progesterone•Occurs if egg is not fertilized
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Menstrual Cycle Flow ChartMenstrual Cycle Flow ChartFollicle Stage: (10-14 days)Follicle Stage: (10-14 days)
•Low estrogen = FSH to be released (negative feedback)•This stimulates growth of follicle •Follicle (egg) matures causing estrogen levels to go up
•Uterine lining begins to thicken again
Menstruation (3-5 daysMenstruation (3-5 days)
•Uterine lining sheds and FSH increases•This causes drop in estrogen and progesterone•Occurs if egg is not fertilized
Ovulation (1 day)Ovulation (1 day)
•Major SPIKE of LH•This causes follicle to break and release egg into oviduct
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Menstrual Cycle Flow ChartMenstrual Cycle Flow ChartFollicle Stage: (10-14 days)Follicle Stage: (10-14 days)
•Low estrogen = FSH to be released (negative feedback)•This stimulates growth of follicle •Follicle (egg) matures causing estrogen levels to go up
•Uterine lining begins to thicken again
Menstruation (3-5 days)Menstruation (3-5 days)
•Uterine lining sheds and FSH increases•This causes drop in estrogen and progesterone•Occurs if egg is not fertilized
Ovulation (1 day)Ovulation (1 day)
•Major SPIKE of LH•This causes follicle to break and release egg into oviduct
Corpus Luteum Phase (10-14 days)Corpus Luteum Phase (10-14 days)
•LH and FSH levels crash•Corpus luteum forms from broken follicle•Corpus luteum secretes estrogen and progesterone
•This thickens uterine lining to prepare for egg
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Negative Feedback: When one hormone is increased it shuts off another hormone
Ex. Glucagon is high, Insulin is Low
What is going on all at once?
Uterus response
Ovary response
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REPRODUCTIVE TECHNOLOGYIn vitro Fertilization Process
http://www.youtube.com/watch?v=GeigYib39Rs http://www.sumanasinc.com/webcontent/animations/content/invitrofertilization.html
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Directions: READ your review book pageS 71-72. Fill out the blank columns for each of the 4 technologies listed.
Technology Purpose
Agriculture 1.
2.
Ecology 1.
2.
Health Care 1.
2.
3.