coagulate after ejaculation. The fluid secreted by the seminal vesicle normally constitutes about 60% of the volume of semen.Seminiferous tubules: long tightly coiled tubes contained in the chambers of the testis wheresperm is produced; it joins with vas deferens. Meiosis takes place here, which is the creationof gametes, aka sperm. Sertoli cells or sustentacular cells: a supporting cell located in the seminiferous tubules that secretes fluid for supplying nutrients to sperm and the hormone inhibin, which removes excess cytoplasm from spermatogenic cells, and mediates the effects of FSH (follicle-stimulating hormone) and testosterone on spermatogenesis. Junctions of the Sertoli cells form the blood-testis barrier, which is a barrier formed by Sertoli cells that prevents an immune response against antigens produced by spermatogenic cells by isolating the cells from the blood). Sertoli cells support and protect developing spermatogenic cells in several ways: nourishing spermatocytes, spermatids, and sperm; phagocytize excess spermatid cytoplasm as development proceeds; and control movements of spermatogenic cells and the release of sperm into the lumen of the seminiferous tubule. They also produce fluid for sperm transport, secrete the hormone inhibin, and regulate the effects of testosterone and FSH. Responsible for nurturing and development of sperm cells; provides both secretory andstructural support activated by FSH. Also called “mother cells” or “nurse cells”. Urethra: a duct from the urinary bladder to the exterior of the body that conveys urine in females and urine and semen in males. Connects the bladder to outside the body.Scrotum: the supporting structure for the testes consists of loose skin and underlying subcutaneous layer that hangs from the root of the penis. A pouch if skin that holds testes and their accessory structures and regulates temperature at slightly below body temperature. Testes: gonads that produce sperm and male sex hormones and function in the production ofinhibin and testosterone by cells of Leydig in the testicles Assignment 3 :: Biology 235: Human Anatomy and Physiology 17
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