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Reproductive System and Development

Reproductive System and Development. Figure 27.4A. Urinary bladder (excretory system). Seminal vesicle (behind bladder). Prostate gland. Bulbourethral gland. Urethra. Erectile tissue of penis. Scrotum. Vas deferens. Epididymis. Testis. Glans of penis. Figure 27.4B.

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Reproductive System and Development

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  1. Reproductive System and Development

  2. Figure 27.4A Urinary bladder(excretorysystem) Seminalvesicle(behindbladder) Prostate gland Bulbourethralgland Urethra Erectile tissueof penis Scrotum Vas deferens Epididymis Testis Glans ofpenis

  3. Figure 27.4B Rectum(digestivesystem) Urinary bladder(excretory system) Seminal vesicle Vas deferens Pubic bone(skeletal system) Ejaculatoryduct Prostate gland Erectiletissue Bulbourethral gland Urethra(excretorysystem) Anus(digestive system) Penis Vas deferens Epididymis Glans of penis Testis Testicle Prepuce Scrotum

  4. Figure 27.5A_1 Penis Epididymis Seminiferoustubule Testis Scrotum Testis Cross section ofseminiferous tubule

  5. Figure 27.5A Penis Epididymis Seminiferoustubule Testis Scrotum Testis 2n Diploid cell Differentiation andonset of meiosis I 2n Primaryspermatocyte Cross section ofseminiferous tubule (diploid; in prophaseof meiosis I) Meiosis I completed n n Secondaryspermatocyte (haploid) Meiosis II n n n n Developingsperm cells Differentiation Sperm cells n n n n (haploid) Mature sperm released into center ofseminiferous tubule

  6. Figure 27.4C 2 1 Sphinctercontracts Urinarybladder Urethral region hereexpands and fillswith semen Contractionsof vas deferens Contractionsof seminalvesicle Contractionsof prostategland Contractionsof epididymis Sphinctercontracts Sphincter remainscontracted Semen expelled Contractionsof musclesaround baseof penis Contractionsof urethra Sphincter relaxes

  7. Figure 27.4D Stimuli from otherareas in the brain Hypothalamus Releasinghormone Anteriorpituitary Negative feedback FSH LH Androgenproduction Testis Spermproduction

  8. Figure 27.3A Ovaries Oviduct Follicles Corpus luteum Uterus Wall of uterus Endometrium(lining of uterus) Cervix(“neck” of uterus) Vagina

  9. Figure 27.3C Oviduct Ovary Uterus Rectum(digestive system) Urinary bladder(excretory system) Pubic bone(skeletal system) Cervix Urethra(excretory system) Vagina Shaft Clitoris Prepuce Glans Vulva Labia minora Labia majora Anus(digestive system) Vaginal opening

  10. Figure 27.5B_1 Beforebirth Diploid cell Ovary Differentiationand onsetof meiosis I Primaryoocytewithinfollicle Primary oocyte (arrested in prophaseof meiosis I; presentat birth)

  11. Figure 27.5B_2 Growingfollicle Completion of meiosis Iand onset of meiosis II Maturefollicle Rupturedfollicle Firstpolar body Secondary oocyte (arrested at metaphaseof meiosis II; releasedfrom ovary) Ovulatedsecondary oocyte

  12. Figure 27.5B_3 Rupturedfollicle Firstpolar body Secondary oocyte (arrested at metaphaseof meiosis II; releasedfrom ovary) Ovulatedsecondary oocyte Entry of sperm triggerscompletion of meiosis II Secondpolar body Corpus luteum Mature egg(ovum) Degeneratingcorpus luteum

  13. Figure 27.9C 1 2 3 4 5 6 7 A sperm touchesthe egg’s jellycoat, and its acrosomereleases enzymemolecules. The sperm’sacrosomalenzymes digest theegg’s jelly coat. Proteins on thesperm head bindto egg receptors. The plasma membranesof sperm and egg fuse. Acrosomalenzymes The sperm nucleus entersthe egg cytoplasm. Plasma membrane The vitellinelayer separatesand becomesimpenetrable. Sperm Nucleus Acrosome Receptor proteinmolecules Plasmamembrane Spermnucleus n Vitellinelayer Cytoplasm n The nuclei of spermand egg fuse. n Jellycoat Eggnucleus n Egg cell 2n Zygote nucleus

  14. Figure 27.10_s1 Zygote 2 cells

  15. Figure 27.10_s2 Zygote 2 cells 4 cells 8 cells

  16. Figure 27.10_s3 Zygote 2 cells 4 cells 8 cells Many cells (solid ball)

  17. Figure 27.10_s4 Zygote 2 cells 4 cells 8 cells Many cells (solid ball) Blastocoel Blastula(hollow ball) Cross sectionof blastula

  18. Table 27.11

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