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Bio 150, Week 2 Notes

by: Morgan Bell

Bio 150, Week 2 Notes Bio 150

Marketplace > Converse College > Biology > Bio 150 > Bio 150 Week 2 Notes
Morgan Bell

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About this Document

Material Covered 9/5-9/9
Biology of Sexuality
Dr. Steele
Class Notes
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This 2 page Class Notes was uploaded by Morgan Bell on Sunday October 9, 2016. The Class Notes belongs to Bio 150 at Converse College taught by Dr. Steele in Fall 2016. Since its upload, it has received 15 views. For similar materials see Biology of Sexuality in Biology at Converse College.


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Date Created: 10/09/16
Bio 150­Week 2 9/5/16­9/9/16 Male Sexual Anatomy  Male Sexual Organs   Testis  Primary male reproductive organ  Produce sperm and hormones  Hang outside body cavity  Temperature inside the body cavity is too warm for sperm to mature; temperature of scrotum is  3  lower  Scrotum  Encloses testis  Cremaster Muscle  Lifts/lowers testis  Regulates temperature outside testis  Dartos Msucle  Wrinkles scrotal sac  Pampiniform Plexus  Cools arterial blood  Regulates temperature outside testis  Inguinal Ring  Opening in abdominal in abdominal cavity where testes descend into scrotum  Cryptorchidism    failure of testes to descend  crypt­ “hidden”  orchid­ “testis”  if not corrected, can cause testicular cancer  adult males with this condition will be sterile (cannot have children)  Testis internal Anatomy  Seminiferous tubules    site of sperm production (spermatogenesis)  ~ 1,000 tubules; ~ several hundred ft.  Spermatoagonia “mother cell”  46 Chromosomes (diploid) → meiosis (cell division)→23 chromosomes (haploid) →develop tails  (flagella)  3 Cell Types in Seminiferous Tubules  Spermatogonia (2n) – undergo meiosis to become sperm (n)  Sertoli cells – nourishment of developing sperm  Leydig cells – testosterone production  Male Reproductive Ducts  Epididymis  Site of sperm maturation and storage; ~20 ft.  Vas deferens  Transports sperm; vasectomy?  Ejaculatory duct   Transports sperm, semen, and urine  Urethra  Passageway for sperm, semen and urine (but not at the same time)  Seminal Glands  Seminal Vesicle – produces 70% of seminal fluid  Alkaline mucus  Fructose – energy source  Prostaglandin – causes uterine contraction  Prostate Gland  Milky alkaline fluid  Cowper’s Gland  Also bulbourethral gland   Clear mucus; lubricant  BPH – enlargement of prostate; normal with aging  Can block urine flow  Prostate cancer   can be detected using PSA (prostate specific antigen) test    high level of PSA possible prostate cancer  Male Sexual Organs  Penis  Sexual pleasure  Reproduction  Elimination of waste  Parts:  Glans  Corona  Shaft   Urethra   Erectile tissues  Prepuce (foreskin)  Erectile Tissues  2 Corpora cavernosa  1 Corpus spongiosum  Surrounds urethra  Arteries vasodilate; engorge with blood  Erection physiology 1. Stimulation  2. nitric oxide (NO) release in arteries of corpora cavernosa 3. NO causes production of cGMP (a chemical messenger)  4. cGMP causes arteries to relax and vasodilate 5. Erectile tissues engorge with blood; fluid pressure causes erection 6. cGMP broken down by enzyme → erection ends *smegma­accumulation of sweat, skin oil, and bacteria around the foreskin (makes it smell; reason for  circumcision)


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