POLI 4020 Chapter : PowerPoint 1
Document Summary
Name: name two structures that aid in thermoregulation of the testes and describe (briefly) how each functions to regulate temperature? (4 points) Pampiniform plexus; countercurrent heat exchange (from blood in veins and arteries) Cremaster muscle; contracts and relaxes to elevate or lower testes. Tunica dartos; contracts and relaxes to increase/decrease scrotal surface area and to hold testes closer to/further from body. Seminiferous tubule: what is the name for the most immature form of spermatozoa? (1 point) Spermatogonia: where (structure and region) do spermatozoa gain the ability to become motile and to fertilize an oocyte? (2 points) Best answer: begins in the body, is completed by the time they reach the tail: name the 3 accessory sex glands present in male mammals. (3 points) Bulbourethral glands: what are the three germ layers of the embryo? (3 points) Ectoderm: what are the 2 primitive duct systems present in the sexually indifferent embryo (2 points)
