Copyright 2003 by Mosby, Inc. All rights reserved. CHAPTER 20 REPRODUCTIVE SYSTEM

Copyright 2003 by Mosby, Inc. All rights reserved. Structure and Function Function of the reproductive system is to produce offspring Puberty is the age at which the reproductive organs mature sufficiently to allow reproduction Reproductive organs of both the male and female produce sex cells called gametes A combination of the female gamete (ova) and male gamete (sperm) is called fertilization

Copyright 2003 by Mosby, Inc. All rights reserved. Male Organs of Reproduction Testes –Produce sperm and secrete testosterone causing the appearance of secondary sexual characteristics like facial and body hair, deepened voice, increased muscle mass, and thickening of the bones Epididymis –A tube on the surface of each testis that stores the sperm while they mature Penis –Semen and urine are excreted

Copyright 2003 by Mosby, Inc. All rights reserved. Female Organs of Reproduction Ovaries –Glands that produce eggs and hormones estrogen and progesterone Fallopian tubes –Transport the mature ovum from the ovary to the uterus Uterus –A muscular structure in which the zygote is implanted following conception

Copyright 2003 by Mosby, Inc. All rights reserved. Female Organs of Reproduction (continued) Cervix –Neck of the uterus; for delivery of a fetus Vagina –A muscular tube that extends from the cervix to the exterior of the body

Copyright 2003 by Mosby, Inc. All rights reserved. Female Organs of Reproduction (continued) Clitoris –Small projection of tissue located between the labia minora Mammary glands –Ducts that secrete milk (lactation) following pregnancy

Copyright 2003 by Mosby, Inc. All rights reserved. Menstrual Cycle Lasts approximately 28 days A complex process of hormone secretion and tissue changes in the uterus A mature ovum is released from an ovary on about the 14th day of each cycle If the released ovum is not fertilized, the endometrium is released from the body along with the ovum The sloughing of this bloody tissue, or menses, lasts from 3 to 7 days The menstrual cycle continues until 45 to 50 years of age

Copyright 2003 by Mosby, Inc. All rights reserved. Figure 20-6 Menstrual Cycle

Copyright 2003 by Mosby, Inc. All rights reserved. Pregnancy Pregnancy results from the union of the ovum and sperm, usually in the fallopian tube Growth of an offspring in the uterus lasts about 280 days (9 months) The fertilized egg is known as a zygote from the time of conception to 2 weeks It is then considered to be the morula and enters the uterus

Copyright 2003 by Mosby, Inc. All rights reserved. Pregnancy (continued) As a blastocyst, it implants in the uterine wall and is considered to be an embryo through the eighth week From 8 weeks to birth, the unborn baby is called a fetus During the first 30 days of life, the baby is considered to be a neonate

Copyright 2003 by Mosby, Inc. All rights reserved. Labor and Delivery Three stages of labor –First stage: muscle contractions of the uterus cause the amniotic sac to rupture and the cervix to open (dilate) to about 10 cm in diameter allowing passage of the fetus –Second stage: delivery of the baby, called parturition –Third stage: delivery of the afterbirth, or placenta, which takes place about 15 minutes later

Copyright 2003 by Mosby, Inc. All rights reserved. Growth and Development Growth refers to the changes that can be measured by changes in height and weight as well as changes in body proportions Development describes the stages of change in psychological and social functioning

Copyright 2003 by Mosby, Inc. All rights reserved. Assessment Techniques Cystoscopy Prostate-specific antigen (PSA) Pap smear Mammography Amniocentesis Ultrasonography Chorionic villus sampling (CVS) Self-examinations

Copyright 2003 by Mosby, Inc. All rights reserved. Disorders of the Reproductive System Benign prostatic hypertrophy –An age-associated condition in men in which the prostate grows and may stiffen, causing blockage of the urethra Cancer of the female reproductive system –Breast, endometrial, and cervical Cancer of the testes Chancroid –A contagious bacterial infection characterized by painful ulcers on the genital area

Copyright 2003 by Mosby, Inc. All rights reserved. Disorders of the Reproductive System (continued) Chlamydia –Caused by the bacteria Chlamydia trachomatis, is the most common sexually transmitted disease Cryptorchidism –The failure of the testes to descend into the scrotal sac prior to birth Ectopic pregnancy –One that occurs in an abnormal location in the body

Copyright 2003 by Mosby, Inc. All rights reserved. Disorders of the Reproductive System (continued) Endometriosis –Growth of endometrial tissue in an area other than the uterus Erythroblastosis fetalis –Condition that may develop in an Rh+ fetus of an Rh- mother who has developed antibodies against the Rh blood protein in a prior pregnancy Fetal alcohol syndrome –Physical and mental birth defects that result from damage to the fetus by alcohol consumed by the mother

Copyright 2003 by Mosby, Inc. All rights reserved. Disorders of the Reproductive System (continued) Fibroid tumors –Benign growths found in the uterus Genital warts –Caused by one type of human papillomavirus Gonorrhea –Bacterial infection and one of the most prevalent sexually transmitted diseases Herpes simplex virus –One of the most common sexually transmitted diseases

Copyright 2003 by Mosby, Inc. All rights reserved. Disorders of the Reproductive System (continued) Human papillomavirus –Infection often does not cause visible symptoms Klinefelter's syndrome –A defect appearing in males who carry an extra chromosome resulting in a karyotype of XXY Leukorrhea –A whitish vaginal discharge Menstrual disorders Orchitis –An inflammation of the testes

Copyright 2003 by Mosby, Inc. All rights reserved. Disorders of the Reproductive System (continued) Pelvic inflammatory disease (PID) –Associated with infection by gonorrhea or Chlamydia Phimosis –A narrowing of the foreskin of the glans penis Premenstrual syndrome (PMS) –Women experience irritability, depression, impaired concentration, headache, and edema Pubic lice –Yellow-gray parasites found in the pubic hair

Copyright 2003 by Mosby, Inc. All rights reserved. Disorders of the Reproductive System (continued) Syphilis –Caused by a spirochete bacteria, Treponema pallidum Trichomonas vaginalis –A parasitic protozoon Vaginitis –A nonspecific infection Yeast infection –An overgrowth of yeast in the vagina

Copyright 2003 by Mosby, Inc. All rights reserved. Issues and Innovations Alternatives in conception – Birth control – In vitro fertilization – Surrogacy Infertility – One out of every six couples is infertile – Factors include low sperm count, STDs, and stress Redefining the sexes – Homosexual and bisexual