Exam 23: Pregnancy, Growth, and Development

In the day or two before milk secretion begins, the breasts secrete ________.

Proteolytic enzymes from the trophoblast aid implantation of an embryo.

Muscle contractions of the uterine walls and ________ in the semen aid sperm cell movement through the uterus and uterine tubes.

The fertilized ovum is also called a _____.

Development is a continuous process and includes growth.

Repair enzymes correct

Dizygotic twins result from

The primary function of surfactant is to increase surface tension in the newborn's lungs.

The implantation of the blastocyst results from

The hormones that maintain the uterine wall during the last 5 to 6 months of pregnancy are

Which of the following factors stimulates a newborn's first breath?

The placenta allows

__________ are substances that interfere with development of an embryo, causing congenital malformations.

A major difference between fetal blood flow and adult blood flow is that in the fetus the

Following birth, the infant's metabolic rate

Which of the following adult structures is not derived from the same primary germ layer as the others?

In an adult, the proximal portions of the umbilical arteries persist and supply blood to the _____ _____.

Compared to cow milk, human milk has

The cells of a blastocyst that help form the chorion constitute the

Single genes that are important in determining how long a person lives affect