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Human Reproduction

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by

Nabil Basri

on 31 January 2013

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Transcript of Human Reproduction

Human Reproduction The Science of Love The 3 Stages of Love Stage 1: Lust Driven by the sex hormones Testosterone Estrogen Stage 2: Attraction Teenagers Hit Puberty Male And Female Meet Adrenaline Hormones Kick In Dopamine Serotonin Gives the charming effect. When you're near your 'love' your heart races. Gives the feeling of being 'love struck'. Stimulates 'desire and reward' and focused on 'new love'. Makes 'new lover' keep popping in your thoughts. Stage 3: Attachment When you are truly love struck and can think of little else. The bond that keeps couples together long enough to raise children. Oxytocin Vasopressin Both released after sex Deepens feelings and makes couples feel much closer. The protective hormone in a long term relationship. Sperm Cell Journey Of The Gametes Egg Cell Scrotum containing Testis produce Sperm travels through Vas Deferens and Epididymis
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Seminal vesicle and Prostate Gland becomes
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provides fluids Journey of the Male Gamete Genetic Code Semen travels through Urethra moves outside body Journey of the Female Gamete Genetic Code Fertilization Zygote Cell Cycle Mitosis Phase 1: Prophase Phase 2: Metaphase Phase 3: Anaphase Phase 4: Telophase Nucleolus and Nuclear Membrane disappear Spindle fibres begin to form Spindle fibres stretch across the cell Spindle fibres pull and tug on Double-stranded chromosomes In a line across the middle Spindle fibres shorten and contract Replicated strands Move to opposite ends of the cell Two nuclei Complete set of chromosomes at each end Nucleus forms and spindle fibres disappear Process Repeats Itself DNA Replication Stage Blastocyst Implantation Fetal Development About Fetal Development There are 3 trimesters During each trimester: Major changes happen Each trimester last for about 3 months Trimester 1 Embryo Fetus Becomes (Weeks 1-12) All major organs have begun developing Has beginning of liver, stomach, heart and brain Trimester 2 (Weeks 12-24) Fingerprints have developed Brain grows and nervous system functions Organs are formed but not fully developed Trimester 3 (Weeks 24-38) Immune System develops Fetus opens its eyes All organs are fully developed It's a baby! Face Hand Birth Three stages of birth Dilation Stage Uterine contractions + oxytocin makes cervix open/dilate Water breaks (amnion breaks) Expulsion Stage Forceful contractions push baby through cervix Baby's head rotates so it is easier to go through birth canal Placental Stage Placenta and umbilical cord are expelled from the uterus Baby is Born! Young Child Teen Adult The process will continue to repeat itself for as long as humans will exist. Thank You By: Nabil Basri 9-5
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