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Human Reproduction Test - 47

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Human Reproduction Test - 47
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  • Question 1
    1 / -0
    Menstruation is caused by
    Solution
    The level of progesterone hormone decreases after the regression of corpus luteum, causes the uterus to shed its lining and egg in a process termed as menstruation. 
  • Question 2
    1 / -0
    In rabbit, the head of epididymis present at head of testis is known as
    Solution
    Epididymis, a part of the male reproductive system which is involved in the conduction of  sperm from the testes to the ductus deferens. This can be differentiated into three regions- the head(Caput), body(Corsa) and tail(Cauda).
    So, the correct answer is option A.
  • Question 3
    1 / -0
    Prostate gland produces a secretion for
    Solution
    Sperms which are released from the seminiferous tubules are transported by the accessory ducts. Secretions of epididymis, vas deferens, seminal vesicle and prostate are essential for maturation and motility of sperms. The seminal plasma along with the sperms constitute the semen. The functions of male sex accessory ducts and glands are maintained by the testicular hormones (androgens).
    Therefore, the correct answer is option B.
  • Question 4
    1 / -0
    Seminal vesicles are located in
    Solution
    Correct answer (C)
    Explanation of correct answer: 

    • The largest male sex glands are the seminal vesicles, which are located below the bladder and above the bulbourethral glands, or Cowper's gland.
    • The seminal vesicles are a pair of male reproductive system accessory sex glands.
    • Seminal vesicles secrete a significant proportion of the seminal fluid that ultimately becomes semen when mixed with sperm.
  • Question 5
    1 / -0
    Graafian follicle contains
    Solution
    As a primary follicle begins to mature, there is an increase in the mass of ovum and the surrounding follicular cells. As the follicle grows, it develops two layers covering its outer surface. The thecal cells are stimulated by FSH and the granulosa cells in response to LH secrete estrogen. Each follicle has a single oocyte. 
    When the mature (graafian) follicle ruptures, the granulosa/follicle cells remaining in the ovary form the corpus luteum, that secretes both estrogen and progesterone. If pregnancy occurs, the corpus luteum will continue to function as an endocrine gland for the entire pregnancy.
  • Question 6
    1 / -0
    Given above is a diagrammatic sketch of a portion of human male reproductive system. Select the correct set of the names of the parts labelled A, B, C, D respectively.

    Solution
    Sperm cells leave the seminiferous tubules of each testis and pass into a larger coiled tube, the epididymis. There, sperm finish maturing and are stored. During ejaculation, sperm passes from each epididymis into a sperm duct, the vas deferens. The vas deferens extends from the scrotum through the inguinal canal and into the pelvic cavity. Each vas deferens empties into a short ejaculatory duct, which passes through the prostate gland and then opens into the single urethra. The urethra, which at different times conducts urine and semen, passes through the penis to the outside of the body.
    Thus, the sperm pass through the following structures:
    Seminiferous tubules --> epididymis --> vas deferens -->ejaculatory duct --> urethra --> release from body
    As sperms travel through the conducting tubes, they mix with secretions from three types of accessory glands. Semen consists of about 200 million sperm cells suspended in the secretions of these glands. The paired seminal vesicles secrete a fluid rich in fructose and prostaglandins into the vasa deferentia. The fructose provides energy for the sperm after they are ejaculated. Prostaglandins stimulate contractions of the uterus, which help move sperm up the female reproductive tract. The single prostate gland secretes an alkaline fluid containing calcium, citric acid,and enzymes. The prostatic fluid may be important in neutralizing the acidic environment of the vagina and in increasing sperm cell motility. During sexual arousal, the paired bulbourethral glands, located on each side of the urethra, release a mucous secretion.
  • Question 7
    1 / -0
    The functional maturation of sperms takes place in
    Solution
    In each testis, there are 200 to 300 lobules and within each lobule are 1 to 4 convoluted loops composed of germinal epithelial cells, called as seminiferous tubules. Between the tubules, there are groups of interstitial cells (of Leydig) that secrete the hormone testosterone after puberty. At the upper pole of the testis the tubules combine to form a single tubule. This tubule, about 6 m in its full length, is repeatedly folded and tightly packed into a mass called as the epididymis. It leaves the scrotum as the deferent duct (vas deferens) in the spermatic cord. Blood and lymph vessels pass to the testes in the spermatic cords. Spermatozoa (sperm) are produced in the seminiferous tubules of the testes and mature as they pass through the long and convoluted epididymis, where they are stored.
  • Question 8
    1 / -0
    In the urinogenital organs of rabbit, which one of following part is present in male but not in female?
    Solution
    The vas deferens is a duct that is a part of many animals including man. There are two of these ducts. They are muscular tubes (surrounded by smooth muscle). They connect the left and right epididymis to the ejaculatory ducts in order to move the sperms. Each tube is about 30 centimeters long. Vagina and Fallopian tube are only present in females while urethra is present in both males and females. Hence, option D is correct.
  • Question 9
    1 / -0
    Which of these secretes seminal fluid?
    Solution
    The function of the prostate gland is to secrete a slightly alkaline fluid, milky or white in appearance, that constitutes around 30% of the volume of semen along with spermatozoa and seminal vesicle fluid.
    Seminal vesicles secrete a significant proportion of around 50-70% of the fluid that ultimately becomes the semen.
    The Cowper's glands or the bulbourethral gland contributes to about 0.1-0.2  ml or 5% of the semen ejaculate.
    Thus, the correct answer is the option (D), 'All of the above'.
  • Question 10
    1 / -0
    Which one of the following is the incorrect matching of the events occuring during menstrual cycle?
    Solution
    In secretory phase, Corpus luteum is developed from the remaining parts of Graafian follicle. Corpus luteum secretes large amounts of progesterone which is essential for maintenance of endometrium which is thickened by estrogen. In this phase, the endometrium further thickens due to estrogen hormone. LH hormone stimulates the corpus luteum to secrete estrogen and progesterone which inhibit the release of FSH and LH. This phase lasts for 14 days. So, secretion of FSH is decreased during this phase. Due to decreased secretion of FSH, development of new follicles during the secretory phase is prevented.
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