Exam 20: Development

Trophoblast cells secrete human chorionic gonadotropin,which has an action similar to luteinizing hormone.

The cells that give rise to the primary germ layers are the

The solid ball of blastomeres that is the result of cleavage is a(n)

The normal stimulus for the baby to take its first deep breath is

Near the end of gestation,the inhibition of uterine muscle contractions is removed by _____ levels of _____.

During pregnancy,milk production is inhibited by

All of the following are derived from ectoderm EXCEPT

What is the term for the yellowish fluid that is secreted by the mammary glands prior to milk production?

The period of development after birth is called

What is the term for the period of prenatal development during which organogenesis occurs?

Fertilization is the

Milk is not produced unless prolactin is stimulated by a baby's suckling.

How long does the pre-embryonic period last?

The extraembryonic membrane that is the source of primordial germ cells is the

The temporary organ that functions in the exchange of gases,nutrients,and waste between maternal and fetal blood is the

What is the term for the postnatal period that begins at birth and lasts about 4 weeks?

What is the term for the region where fertilization generally occurs?

All of the following occur during the pre-embryonic period EXCEPT

The longest period in prenatal development is the _____ period.

The period during which language,reading,writing,and other intellectual skills develop is