Unit 2 02-10-2016
Unit 2 02-10-2016 BIOL 2350
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This 2 page Class Notes was uploaded by Faiqa Rahman on Thursday February 11, 2016. The Class Notes belongs to BIOL 2350 at University of Texas at Dallas taught by Dr. Ilya Sapozhnikov in Spring 2016. Since its upload, it has received 54 views. For similar materials see Biological Basis for Health and Disease in Biology at University of Texas at Dallas.
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Date Created: 02/11/16
BBHD Unit 2 -‐02/10/2016 Gonads produce gametes in testes Spermatogenesis: • begins at the time of puberty (age 11-‐14) and lasts for a lifetime. • Begins at the testis (singular) • Produce no less than 5 million of sperm cells Average age of cessation of ova 50.8 years Oogenesis: • produces one egg per month. • Typical cycles 28 days. • Cyclic event last 30-‐35 years Testis located outside of the body in pouch called scrotum. Required temperature for spermatogenesis to make spermatozoa is 95 degrees Fahrenheit. Scrotum has a thin layer of smooth muscle. Darthos muscle: • High temperature= testis away because scrotum relaxes • Low temperature= testis closer because scrotum contracts and shrinks Skeletal muscle relaxes or contracts. On top of testis Veins are set as a “fridge” to cool the scrotum. Testis one inch wide and one inch thick Tunica albuginea: • means whitish layer encases the testes. • This also encases the ovary. Tunica vaginalis: • is the continuation of the lining of the abdominal pelvic area. Hydrocele: the accumulation of fluid in testis not serious health wise but very uncomfortable. Seminiferous tubules: • hormonal production and spermatogenesis Spermyogenesis: • maturation (3 months) Leydig cells • produce testosterone During Puberty: • Voice box thickens and shortens , • broadens shoulders • narrow pelvis. Interstitial cells produce testosterone Spermatogenic cells mature spermatozoa Sertoli Cells (Nursing cells): give shape. Vas deferens: • structure tube, which ascends the site of the pelvic cavity. • Dilation and spermatozoa is stored and undergo some final alignments for the maturation. • But mainly for storage. • It is ejaculated from here during ejaculation. • Spermatozoa can survive and retain viability for 6-‐8 weeks. If not it is absorbed to the blood. Seminal vesicles yellowish fluid containing fructose Ejaculatory duct pierces the prostate gland. Prostate Gland: • The prostate gland is the size of a walnut. • The gland produces a second element of seminal fluid. • Highly alkaline fluid is produced there so it can neutralize the acidic environment of the penis from urethra. As well as the vagina’s acidic pH 2.5. Circumcised males have 60% less chance of getting AIDS than noncircumcised males
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