Transports sperm to female Nourishes sperm Protects sperm Sperm Structure Head acrosome enzymes allow penetration of ova nucleus DNA essential for new organism Middle piece lots of mitochondria ID: 620552
Download Presentation The PPT/PDF document "Semen" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Semen
Transports sperm to femaleNourishes spermProtects spermSlide2
Sperm - Structure
Headacrosomeenzymes allow penetration of ovanucleus
DNA, essential for new organism
Middle piece
lots of mitochondriaTailflagellum rotates like corkscrewSlide3
Fluid
Glands secrete itSeminal Vesicles (4)drain into ejaculatory duct Prostate gland
ejaculatory duct join urethra
secretes fluid into urethra
Bulbourethral gland (COWPER'S)drains into urethra at the base of the prostate
Produce
95% of the
ejaculate volume Slide4
Nutrients
Seminal vesiclefructose (energy)prostaglandins (muscle contraction in female)
Prostate gland
Alkaline buffer (against acid in vagina – like tums)
Bulbourethral gland (cowper's)mucus (pre-cum, cleans urethra, aid movement)Slide5
Spermatogenesis
creation of spermSlide6
Occurs in Testes
Seminiferous tubulesSertoli CellsRespond to FSH
Start sperm production, and nourish developing sperm
Leydig cell
Sperm
Lumen seminiferous tubule
Sertoli Cells
Cross Section of TestisSlide7
Spermatogenesis – in tubulesSlide8
Why males can produce for their lifetime.
Spermatogoniastem cells that are the precursors of sperm.
divide by
mitosis
to produce more spermatogonia ordifferentiate into spermatocytes.Slide9
Reductional DivisionSlide10
Testes also produce testosterone
Interstitial spaceLeydig cellsRespond to LH
Start testosterone production into blood
Leydig cell
Sperm
Lumen seminiferous tubule
Sertoli Cells
Cross Section of Testis