BIO 205 Final Male Reproductive System

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ralejo
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152426
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BIO 205 Final Male Reproductive System
Updated:
2012-05-05 23:23:55
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reproductive system pal biology 205
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BIO final male reproductive system
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  1. When does Puberty happen in Boys and Girls?
    • Boys Puberty: 14-16
    • Girls Puberty: 11-13
    • Reproductive system not fully functional until puberty
  2. Functions of Reproductive Organs in Male Only
    Deliver Sperm
  3. Functions of Reproductive Organs in Female Only
    • Receive sperm
    • Transport menses
    • Baby development
    • Birth canal
    • Baby nourishment
  4. Functions of Reproductive Organs in Males and Females
    • Produce sex hormones
    • Produce/transport gametes (cells that go to make the baby)
  5. Cell Cycle
    • 90% of the time, they are in interphase (reproduce genetic material)
    • 10% of the time, Mitosis- Duplicate and divided into half, and go into interphase again

  6. What is Mitosis?
    • Duplication, then division
    • Chromosome duplication --> Sister chromatids --> Chromosome distribution to daughter cells
  7. What is Meiosis
    Duplication of genetic material, then two divisions so we're not going to end up with the same number of chromosomes
  8. What Happens in Meiosis?
    • Daughter cells = Gametes
    • Gamete has half the amount
    • One duplication
    • Two divisions
    • Diploid (2n) --> haploid (n)
  9. Meiosis in the Beginning*
    • Homologous pair of chromosomes (Paternal and Maternal)
    • Replication
    • ...
  10. Meiosis 1
    • Exchange of genetic material
    • Playing "footsies" (called crossing over) and exchanges information like that
    • Random lining up in metaphase
  11. Meiosis 2
    • Divided back down to sister chromatids
    • start with 1 cell in meiosis, end up with 4 daughter cells. None of which are identical to each other
    • 1/2 amount
  12. How do you end up with different looking offsprings?
    • Start off with one cell
    • End up with 4 daughter cells because of genetic exchanges and "footsie" (crossing over) process of the chromosomes
  13. Mitosis Vs. Meiosis
    • Mitosis: 2 that are similar
    • Meiosis: 4 that are not the same
  14. Male Anatomy
    • Testis: Primary sex organ for men. Where most testosterone is made (also made in adrenal cortex)
    • Epididymis: Sits superior and posterior to testis. Where sperm mature.
    • Ductus Deferens (Vas Deferens): Sperm made
    • Seminal Vesicle: Ejaculatory duct. Fluid joins with sperm into ejaculatory duct going through gland under the bladder (prostate gland)
    • Prostate : Prostatic Urethra
    • Cowper Gland (Bulbourethral): Adds fluid (3rd place) to add to the sperm. Travels through penis.
    • Penis: Penile urethra. Glans penis (head of penis). Prepuce (foreskin). Erectile tissue that completely surrounds the urethra (can fill up with blood).
  15. Seminal Fluid
    • Fluid that comes out with the sperm
    • Comes out of 3 glands (seminal vesicle, prostate gland, cowper gland)
    • Seminal Vesicle
    • Fructose
    • Prostaglandins
    • Proteins
    • Prostate
    • Zinc
    • Citric Acid
    • PSA - "unglue" proteins
    • Cowper Gland
    • Mucus (alkaline) because vagina is acidic. Keeps sperm alive long enough to swim up
  16. Semen
    • 95%-97% fluid from 3 glands
    • Only 5% sperm
    • During ejaculation, a man releases up to 500 million sperm
  17. Male Orgasms: Erection
    • Parasympathetic Stimulation
    • Arteriole blood (away from heart) goes to penis causing erection
  18. Male Orgasm: Ejaculation
    • Sperm and semen released
    • Smooth muscle contraction
    • Parasympathetic and sympathetic work together
    • Peristalsis
  19. Impotence (Erectile Dysfunction)
    • Can happen in our age group
    • Blocks blood flow in the tissue during prolonged erection (4-8 hours)
    • Erectile tissue not getting enough blood
  20. Making of Male Gametes
    Testicular lobules contain seminiferous tubules
  21. Spermatogenesis
    • Like meiosis, but with sperms
  22. Spermiogenesis
    • (nip-tuck -making it look like sperm but not completely)
    • Sertoli
    • Tight junctions
    • Nurse Cells
  23. Spermatozoa
    • Sperm can survive 2-3 days, but up to a week
    • Centriole
    • Only long flagellum to swim
    • Can survive outside the body for a week
  24. Sperm Anatomy
    • Head - Acrosome nucleus
    • Midpiece - Mitochondria
    • Tail - Flagellum
  25. Male Hormones
    • Hypothalamus:
    • Gonadotropic releasing Hormone (GnRH)
    • Has an effect on anterior Pituitary
    • Will kick out Leutinizing Hormone (LH): Interstitial cells of testes
    • Make Androgens (testosterone)
    • Goes to both hypothalamus and anterior pituitary
    • Follicle Stimulating Hormone (FSH): Has to do with sperm production
  26. Testosterone Effects
    • Lower voice
    • More muscle mass
    • Hair growth
    • Make sperm

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