tailieunhanh - Human Reproduction

Everyone loves the news stories about the taxi driverwho delivers a baby for the woman who could not get to the hospital on time. At some point each of us asks ourselves with awe for the first time, “Where did I come from?” It has been said of the body that it is “fearfully and wonderfully made.” How true this is of the reproductive systems on which the survival of our species depends. In this chapter, you will study the systems of the human body responsible for our being here: the male and the female reproduc- tive systems | 17 Human Reproduction After you have finished reading this chapter you should be able to Describe the structures and functions of the male and female reproductive systems. Explain the importance of hormones to the functioning of reproductive systems. Discuss issues that affect reproductive health contraception infertility and STDs. Where did you come from Baby dear Out of the everywhere into the here. George Macdonald Baby At the Back of the North Wind Introduction Everyone loves the news stories about the taxi driver who delivers a baby for the woman who could not get to the hospital on time. At some point each of us asks ourselves with awe for the first time Where did I come from It has been said of the body that it is fearfully and wonderfully made. How true this is of the reproductive systems on which the survival of our species depends. In this chapter you will study the systems of the human body responsible for our being here the male and the female reproductive systems. THE MALE REPRODUCTIVE SYSTEM__ The male reproductive system has two main functions It produces haploid male gametes the sperm cells and it must be able to deposit the sperm cells it produces inside the female. As described in Chapter 16 360 Chapter 17 Human Reproduction 361 Urinary bladder Twisted tubules Bone of pelvis Prostate gland Abdominal cavity Ureter------- Urethra Sperm duct Penis Coccyx b. Front view a. Sectional view Testis Scrotum - Large intestine Sperm-forming cells Figure 17-1 The male reproductive system. u fiX few 1 B Seminal vesicle Sperm cells c. Microscopic view of cross section of a tubule of testis fertilization in all mammals including humans occurs internally. In addition the male reproductive system provides a pathway for the removal of urine. See Figure 17-1. The first function sperm cell formation occurs in the two testes. The formation of sperm requires a temperature that is a few degrees cooler than the temperature of the rest of .