20 to 24 please D) Sertoli cells E) None of the answers are correct. 20) The imp
ID: 277749 • Letter: 2
Question
20 to 24 please
D) Sertoli cells E) None of the answers are correct. 20) The importance of the pampiniform plexus in the scrotum is to A) allow the testis to move without pinching blood vessels B) support the testis C) help cool the blood to permit spermatogenesis at a temperature cooler than in the abdominal cavity D) innervate the testis E) None of the answers are correct. 21) Spermatogenesis ends with the production of spermatids A) 2 B) 4 C) 6 D) 8 E) 16 22) Which of the following is a function of the ductus deferens? A) Monitor the composition of the fluid contained in it. B) Adjust the composition of the fluid contained in it. C) Recycle damaged spermatozoa. D) Store spermatozoa and facilitate their functional maturation. E) Transport sperm to the prostatic urethra. 23) Which of the following provides an antibiotic called seminalplasmin? A) prostate gland B) seminal glands C) bulbo-urethral glands D) seminiferous tubules E) epididymis 24) The junction of the ductus deferens ampulla and the base of the seminal gland marks the start of the A) ureter B) ejaculatory duct EscExplanation / Answer
20. C...The pampiniform plexus helps regulate the temperature of the testes by acting as a “heat exchange” mechanism to cool down the blood. The arteries supplying the testes run through the plexus where the blood is cooled from abdominal arterial temperature to testicular temperature.
21. B . This process starts with the mitotic division of the stem cells located close to the basement membrane of the tubules. These cells are called spermatogonial stem cells. The mitotic division of these produces two types of cells. Type A cells replenish the stem cells, and type B cells differentiate into spermatocytes.
The primary spermatocyte divides meiotically (Meiosis I) into two secondary spermatocytes; each secondary spermatocyte divides into two equal haploid spermatids by Meiosis II.
The spermatids are transformed into spermatozoa(sperm) by the process called spermiogenesis.These develop into mature spermatozoa, also known as sperm cells.
22. E..The vas deferens(ductus deferens) transports mature sperm to the urethra, the tube that carries urine or sperm to outside of the body, in preparation for ejaculation.
23. A...The fluid produced by the prostate gland is acidic and It contains seminal plasmin, an antibiotic that inhibits bacteria.
24. B..Each ejaculatory duct is about two centimeters in length and is created when the seminal vesicle's duct merges with the vas deferens.
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