- The hypothalamic hormone that stimulates hormone secretion by the anterior pituitary gland isA) LH.B) FSH.C) inhibin.D) GnRH.E) estradiol.
- A vasectomyA) eliminates spermatogenesis.B) eliminates testosterone synthesis.C) prevents implantation of an embryo.D) prevents sperm from exiting the male urethra.E) prevents oocytes from entering the uterus.
- In humans, the follicular cells that remain behind in the ovary following ovulation becomeA) the ovarian endometrium that is shed at the time of the menses.B) a steroid-hormone synthesizing structure called the corpus luteum.C) the thickened portion of the uterine wall.D) swept into the fallopian tube.E) the placenta, which secretes cervical mucus.
- Compounds containing oxygen as the negative ion are referred to as
- In the above figure, which letter points to the oviduct?A) A B) B C) C D) D E) E
- In the above figure, which letter points to the corpus luteum?A) A B) B C) C D) D E) E
- Mature human sperm and ova are similar in thatA) they both have the same number of chromosomes.B) they are approximately the same size.C) they each have a flagellum that provides motility.D) they are produced from puberty until death.E) they are formed before birth.
- In the above figure, which letter points to the scrotum?A) A B) B C) C D) D E) E
- In the above figure, which letter points to the uterus?A) A B) B C) C D) D E) E
- The moment of orgasm is characterized byA) the ovulation of the oocyte from the ovary.B) the release of sperm from the seminiferous tubules.C) rhythmic contraction of many parts of the reproductive system.D) increased synthesis and release of ovarian steroid hormones.E) increased synthesis and release of testicular steroid hormones.
- External chemical signals that coordinate potential reproductive partners are calledA) hormones B) pheromones C) paracrine signals D) cytokines E) gametes
- In the above figure, which letter points to the testis?A) A B) B C) C D) D E) E
- Which of the following patterns of reproduction are found only among invertebrate animals?A) sexual and asexual reproductionB) external and internal fertilizationC) hermaphroditism and parthenogenesisD) pheromonal and hormonal coordinationE) fission and budding
- The use of birth control pills (oral contraceptives)A) reduces the incidence of ovulation.B) prevents fertilization by keeping the sperm and egg physically separated by a mechanical barrier.C) prevents implantation of an embryo.D) prevents sperm from exiting the male urethra.E) prevents oocytes from entering the uterus.
- Menopause is characterized byA) reduced synthesis of ovarian steroids despite high levels of gonadotropin hormones.B) a decline in production of the gonadotropin hormones by the anterior pituitary gland.C) wearing away of the uterine endometrium.D) an increase in the blood supply to the ovaries.E) a halt in the synthesis of gonadotropin-releasing hormone by the brain.
- Fertilization of human eggs usually takes place in theA) ovary B) uterus C) vagina D) oviduct E) cervix.
- A reproductive hormone that is secreted directly from a structure in the brain isA) testosterone.B) estradiol.C) progesterone.D) follicle-stimulating hormone.E) gonadotropin-releasing hormone.
- For the 10 days following ovulation in a nonpregnant menstrual cycle, the main source of progesterone is theA) adrenal cortex.B) anterior pituitary.C) corpus luteum.D) developing follicle.E) placenta.
- For normal human fertilization to occur,A) many ova must be released.B) the uterus must be enlarged.C) only one sperm need penetrate one egg.D) secretion of pituitary FSH and LH must decrease.E) the secondary oocyte must implant in the uterus.
- A primary response by the Leydig cells in the testes to the presence of luteinizing hormone is an increase in the synthesis and secretion ofA) inhibin.B) testosterone.C) oxytocin.D) prolactin.E) progesterone.