Chapter 38

Most land animals have ___ fertilization. a. internal b. external

An animal that makes eggs and sperm is a ___ a. zygote b. hermaphrodite c. gastrula d. gamete

Testosterone is secreted by the ___. a. testes b. hypothalamus c. prostate gland d. pituitary gland

During a menstrual cycle, a midcycle surge of ___ triggers ovulation. a. estrogens b. progesterone c. LH d. FSH

The corpus luteum develops from ___ a. a polar body b. follicle cells c. a secondary oocyte d. spermatogonia

Match each term with the most suitable description. $$ \text { epididymis } \quad \quad\quad\quad\quad \text { a. carries egg to ovary } $$ $$ \text { vas deferens } \quad \quad\quad\quad\quad \text { b. can be inflated by blood } $$ $$ \text { vagina } \quad \quad\quad\quad\quad \text { c. where sperm mature } $$ $$ \text { seminal vesicle } \quad \quad\quad\quad\quad \text { d. target of vasectomy } $$ $$ \text { penis } \quad \quad\quad\quad\quad \text { e. main contributor to semen } $$ $$ \text { oviduct } \quad \quad\quad\quad\quad \text { f. sheds lining monthly } $$ $$ \text { uterus } \quad \quad\quad\quad\quad \text { g. birth canal } $$

A homeotic gene regulates ___. a. where body parts form b. milk production c. secondary sexual traits d. sperm formation

True or false. All blastomeres have the same cytoplasmic components and express the same genes.

What are the three tissues of a vertebrate gastrula?

A human blastocyst normally implants in ___ a. an oviduct b. a seminferous tubule c. the uterus d. the vagina

Match each hormone with its effect. $$ \text { oxytocin } \quad \quad\quad\quad\quad \text { a. sperm production increases } $$ $$ \text { testosterone } \quad \quad\quad\quad\quad \text { b. uterus contracts } $$ $$ \text { LH } \quad \quad\quad\quad\quad \text { c. LH, FSH are released } $$ $$ \text { GnRH } \quad \quad\quad\quad\quad \text { d. surge causes ovulation } $$ $$ \text { FSH } \quad \quad\quad\quad\quad \text { e. follicle develops } $$ $$ \text { HCG } \quad \quad\quad\quad\quad \text { f. milk is produced } $$ $$ \text { prolactin } \quad \quad\quad\quad\quad \text { g. endometrium is maintained } $$

Put these human developmental events in order, from earliest to latest. a. blastula forms b. heart begins beating c. gastrulation d. implantation e. eyes open f. neural tube forms