Bio 150, Week 2 Notes
Bio 150, Week 2 Notes Bio 150
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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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