muscle; the inner and outer layers are longitudinal, and the middle layer is circular -Seminal Vesicle: Each ejaculatory duct long and is formed by the union of the duct from the seminal vesicle and the ampulla of the ductus (vas) deferens. They end in the prostatic urethra, where they eject sperm and seminal vesicle secretions just before the release of semen from the urethra to the exterior. During ejection seminal vesicles secrete an alkaline fluid containing fructose to nourish sperm and prostaglandins to cause muscular contractions in the female tract to help propel sperm to the egg cell.-Prostate Gland: The prostate slowly increases in size from birth to puberty. It then expands rapidly until about age 30, after which time its size typically remains stable untilabout age. The prostate secretes a milky and acidic fluid. Substances present are;Citric acidin prostatic fluid is used by sperm for ATP production via the Krebs cycle. Proteolytic enzymes like prostate-specific antigen, pepsinogen, lysozyme, amylase, and hyaluronidase. These enyzmes eventually break down the clotting proteins from the seminal vesicles. Seminal plasmin in prostatic fluid is an antibiotic that can destroy bacteria. Seminal plasmin helps decrease the number of naturally occurring bacteria in semen. Secretions of the prostate enter the prostatic urethra through many prostatic ducts. Prostatic Assignment 3 :: Biology 235: Human Anatomy and Physiology 9
Assignment 3 :: Biology 235: Human Anatomy and Physiology 10
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- Fall '15