Chapter 26

\(A(n)\) _________ produces both eggs and sperm. a. hermaphrodite b. asexual organism c. ovary d. testis

The end product of cleavage is a(n) ________. a. blastula b. gastrula c. embryo d. fetus

A(n)___________ is a hollow ball of cells that undergoes gastrulation. a. gastrula b. blastula c. embryonic disk d. inner cell mass

Meiotic divisions of germ cells in the __________ give rise to sperm. a. seminiferous tubules b. prostate gland c. penis d. seminal vesicles

A male has an erection when __________. a. muscles running the length of the penis contract b. nurse cells release a surge of testosterone c. the posterior pituitary releases oxytocin d. spongy tissue inside the penis fills with blood

In humans, fertilization usually occurs in ________. a. the uterus \(\quad\) b. the vagina c. an oviduct \(\quad\) d. an ovary

During a menstrual cycle, a midcycle surge of ___________ secreted by the pituitary triggers ovulation. a. estrogen b. progesterone c. \(\mathrm{LH}\) d. FSH

After ovulation, the corpus luteum secretes __________. a. LH b. FSH c. progesterone d. prolactin

A__________ implants in the lining of the human uterus. a. zygote b. blastocyst c. gastrula d. fetus

Number these events in human development in the correct order. ___________gastrulation ___________blastocyst forms ___________zygote forms ___________tail disappears ___________neural tube forms ___________heart begins beating

Which of the following STDs are caused by bacteria? a. chlamydla d. trichomoniasis b. gonorrhea e. a and b c. genital warts f. all of the above

Human milk contains _______ . a. antibodies b. lactose c. easily digested fats and proteins d. all of the above

During labor, secretion of oxytocin stimulates __________. a. uterine contractions b, softening of the cervix c. production of milk proteins d. ovulation

Match each human reproductive structure with its description. $$ \text {________testis} \quad \quad\quad\quad\quad \text {a. maternal and fetal tissues} $$ $$ \text {________vas deferens} \quad \quad\quad\quad\quad \text {b. adds fluid to sperm in semen} $$ $$ \text {________placenta} \quad \quad\quad\quad\quad \text {c. produces testosterone} $$ $$ \text {________vagina} \quad \quad\quad\quad\quad \text {d. produces estrogen and progesterone} $$ $$ \text {________ovary} \quad \quad\quad\quad\quad \text {e. conveys egg to uterus} $$ $$ \text {________oviduct} \quad \quad\quad\quad\quad \text {f. secretes milk} $$ $$ \text {________prostate gland} \quad \quad\quad\quad\quad \text {g. birth canal} $$ $$ \text {________mammary gland} \quad \quad\quad\quad\quad \text {h. conveys sperm toward urethra} $$