Presentation on theme: "Mrs. DeLillo Living Environment"— Presentation transcript:
1 Mrs. DeLillo Living Environment Human ReproductionMrs. DeLilloLiving Environment
2 3/17 Aim: How are males adapted for reproduction? Do now: How many sperm are produced during meiosis? How do they compare to the parent cell in terms of chromosome # and appearance?HW: Diagram handoutTest signed
3 ReproductionThe formation of new individuals.Not necessary for the survival of the individualNecessary for the survival of the species.
4 3/10 How is the male adapted to carry out reproduction? Do now: How many sperm cells are produced during spermatogenesis? How do they compare in terms of look and # of chromosomes to the parent cell?HW: Handout
5 Gametes: specialized sex cells Fusion of sperm and egg forms a zygote.Zygote = single cellfrom which all cellsof the human bodydevelop.
6 Development1st six weeks=male and female embryos are identical in appearance.During 7th week the primary reproductive organs begin to developTestes = male produce testosteroneOvaries = female produce estrogen and progesterone
15 Ages 9-15 (about a year earlier in females) PubertyPeriod of rapid growth and sexual maturation during which the reproductive system becomes fully functional.Ages 9-15 (about a year earlier in females)
16 Male Reproductive System Main StructuresTestes, epididymis, vas deferens, urethra and penisAll work together to produce and deliver sperm.
17 TestesLocated in the scrotumOutside the body because the cooler temperature is better for sperm production.Within the testes are the seminiferous tubules= location of sperm production
26 Sperm ReleaseAutonomic Nervous system preps the male organsEjaculation: sperm are ejected from the penis due to the contraction of smooth muscles lining the reproductive tract.Not completely voluntary
27 2/14 How is the female adapted to carry out reproduction? Do now: How many functional eggs are produced in oogenesis? How do they compare to the parent cell in terms of look and # of chromosomes?HW: Study for quiz tomorrow on male and female reproduction
28 Female Reproductive System Widening of the hips, development of breasts play a role in this system.Main StructuresOvaries, fallopian tubes, uterus and vagina
31 Female Reproductive System Prepares the body for nourishing an embryoProduces eggs
32 Ovaries2 present in the femaleProduce 1 mature ovum/egg between them per month.
33 Egg DevelopmentEach ovary contains 400,000 immature eggsPrimary Follicle= clusters of cells that surround an eggHelp the egg mature for release into the reproductive tract where it will become fertilized.
34 A female will not produce any new eggs during her lifetime Egg DevelopmentA female will not produce any new eggs during her lifetimeOnly 400 eggs will be released in her lifetime.
35 Where do the eggs develop? Egg is released in a process known as ovulationFollicle breaks open and the egg goes into the fallopian tube aka: oviductThe egg moves along the fallopian tube due to ciliaIt is here where it will become fertilized.
37 After a few days, the egg is dropped into the uterus. If it becomes fertilized (by sperm) then the lining is known as the cervixBeyond the cervix is the vagina which leads to the outside of the body
38 2/16 Aim: How can we describe the stages of the menstrual cycle? Do now: Where does fertilization usually occur?HW: Finish handout and regents questions on menstrual cycle
39 Menstrual CycleEndocrine and Reproductive Systems interact in a series of periodic events known as the Menstrual Cycle.Cycle takes an average of about 28 daysRegulated by hormones controlled by negative feedback.
40 Menstrual CycleEgg develops and is released from the ovaryIf fertilized after ovulation it is implanted in the uterus and embryonic development begins.If not it is shed along with the uterus lining (period)
41 4 Cycles Follicular Phase Estrogen level is low Hypothalamus tells the Pituitary to release FSH and LHThese hormones travel to the ovaries and cause the follicle to matureCells around the egg produce estrogen because estrogen is what prepares the uterusThickens the lining to receive the egg10 days long
42 4 Cycles Ovulation Shortest phase in the cycle Lasts 3-4 days long Occurs midway throughPituitary produces a sudden rush of FSH and LHThe follicle ruptures and the mature egg is released into the fallopian tube.
43 4 Cycles Luteal Phase aka Corpus Luteum Stage Begins after the egg is releasedFollicle turns yellow due to the rupturing of the cellsNow known as the corpus luteum (yellow body)Estrogen is released and progesterone begins to be released as well.
44 4 Cycles Luteal Phase cont. The increased estrogen levels occur during the 1st 14 days which promotes cell growth and tissue development.Blood supply increases which helps the tissues matureThe lining is fully prepared to accept a fertilized egg.During the first 2 days of this phase the fertilization rate is the highest.If fertilized egg will begin to divide.
45 What happens if fertilization doesn’t occur? MenstruationWithin 2-3 days of ovulation, the egg will pass through the uterus without implantationCorpus leuteum will disintegrateHormone levels in the blood decrease.
46 When the level of estrogen drop below a certain point, the lining of the uterus begins to detach from the uterine wall.This tissue, along with blood and the unfertilized egg are discharged through the vagina.This is known as MenstruationLasts 3-7 daysDay 1-5 of the cycle