NATS 1675 Lecture Notes - Lecture 6: Male Reproductive System, Female Reproductive System, Mitosis
Document Summary
Each cell has 46 chromosomes after division. Only occurs to produce sperm or eggs. Meiosis 1: duplicated homologous pair line up to form tetrads and exchange some genetic material, then separate (reduction division) Protect and nourish developing embryo and fetus. Transport of menstrual fluid out of the body. Sperm travel through vans deferent to ejaculatory duct. Seminal vesicles at the base of the bladder pair of glands produce a fluid that nourishes sperm, and assists movement of sperm once in the female reproductive tract. Prostaglandins cause uterus to contract and aid sperm in reaching the egg. Mixture of secretions from seminal vesicle, prostate, and bulbourethal glands. Glanis penis - enlarged tip, covered by foreskin. Nitric oxide from autonomic nerves during arousal results in cgmp production cgmp causes relaxation of arterial walls allowing tissue to fill with blood, and veins to be compressed. Seminal vesicle, bulbourethral glands and prostate contribute fluid to semen. 400 million sperm in 3. 5 ml of semen.
