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Name: _____________________________ Pages: 416-419 Date: ______________ BIOLOGY 12 MALE REPRODUCTIVE SYSTEM 1) Label the following diagrams: 1) Rectum 2) Urinary bladder 3) Seminal Vesicle 4) Prostate gland 5) Bulbourethral gland (Cowper’s) 6) Epididymis 7) Testis (testes = plural) 8) Scrotum 9) Penis 10) Urethra 11) Vas deferens Male Reproductive System↑ 1) Urinary bladder 2) seminal vesicle 3) vas deferens 4) prostate gland 5) bulbourethral gland 6) urethra 7) epididymis 8) seminiferous tubules 9) interstitial cells 10) penis 11) testis 12) scrotum Male Reproductive/Urinary System↑ 13) epididymis W) head (contains chromosomes) X) acrosome (enzymes for entering egg) Sperm→ Y) midpiece (mitochondria for energy) Z) tail (movement) 2) What is the difference between semen and seminal fluid? List the contents of semen in a chart that indicates the function of each component and the gland or structure that produces it. Seminal fluid = secretions from seminal vesicles, prostate gland and bulbourethral gland Semen = sperm + seminal fluid GLAND/ STRUCTURE testes CONTENT FUNCTION sperm Fertilize the egg fructose nourish sperm milky alkaline fluid helps sperm survive in the acidic vaginal canal lubricant aids in sperm motility seminal vesicles prostate gland bulbourethral gland 3) Describe the process of spermatogenesis. Be sure to indicate precisely where it occurs in the testes, and the functions of the hormones LH, FSH and testosterone in its production. Within the seminiferous tubules the spermatagonia divide by mitosis and become primary spermatocytes. Primary spermatocytes divide by meiosis (46 chromosomes 23 chromosomes) to become spermatids (immature sperm). Spermatids are nourished by the seritoli cells and develop to become functional sperm. Mature sperm are stored in the epididymis. FSH acts on spermatogenic cells within the seminiferous tubules to causing them to take in testosterone. LH act on the interstitial cells causing them to produce testosterone Testosterone acts on spermatogenic cells causing them to produce sperm (promotes spermatogenesis) 4) List in order the path of a single sperm cell from a seminiferous tubule to the urethral opening. Seminiferous tubule interstitial cells epididymis vas deferens urethra urethral opening 5) Create a flow chart which summarizes hormonal control of the testes. Then, in a concise but thorough paragraph, describe the control of testosterone levels by the endocrine system. Be sure, in your description, to explain the roles of the hypothalamus, pituitary, GnRH, LH(ICSH), FSH, interstitial cells, testosterone, and inhibin. Be sure to clearly indicate how negative feedback operates in this loop. See Notes p. 3 and text book p. 419 PART 6) What is the location, structure and function of the following parts of the Male Reproductive System? LOCATION STRUCFUNCTION TURE Testis In scrotum Ball Male gonads which produce sperm and testosterone Scrotum Hang underneath penis outside male’s body Sac Hold testes away from body (body temperature is too high for sperm) Seminiferous tubules Within each testis 3 coiled Where sperm is produced tubules (meiosis) Interstitial cells Lie between the seminiferous tubules In the seminiferous tubules On top of each testis Cells Produce testosterone Cells Support, nourish and regulate the spermatogenic cells Tubular storage sac Tube Where sperm mature Pair of organs that that each have a duct to join to each vas deferens Produce secretion containing fructose to nourish sperm Secretes a milky alkaline fluid that helps sperm survive in the acidic vaginal canal Sertoli cells Epididymis Vas deferens From epididymis to urethra Seminal vesicles Join to each vas deferens Tube Prostate gland Surround upper part of urethra just below bladder Doughn ut shaped organ Carries sperm from epididymis to urethra during ejaculation Urethra From urinary bladder; within penis Bulbourethral glands Below the Peaprostate gland sized on either side organ of urethra Penis Cylindrical shaped organ Hypothalamus Part of brain Anterior pituitary gland Part of brain Tube Carries urine from bladder during urination Carries semen during ejaculation (never both at same time) Supplies lubricant to seminal fluid/ semen Hangs Sexual intercourse in front Increased blood flow causes it to of become erect scrotum Controls release of sex hormones Releases GnRH to anterior pituitary Releases FSH and LH/ICSH for spermatogenesis