Final Prep 3

Which of the following indicates the correct order of phases of development?

• Zygote → morula → blastocyst → embryo → fetus → newborn

• Morula → blastocyst → zygote → fetus → embryo → newborn

• Zygote → blastocyst → morula → embryo → fetus → newborn

• Blastocyst → embryo → morula → zygote → fetus → newborn

When does apoptosis occur?

• Only when someone has a disease

• From embryonic stage until death

• Only in adults

• Only after the age 50

What is the development process during which the contents of a zygote are divided into increasingly smaller cells called?

• Cleavage

• Implantation

• Fertilization

• Gastrulation

The fetal stage of development begins at the end of the eighth week.

• True

• False

The ductus venosus is a fetal vessel that transports blood from the umbilical vein to the__________.

• aorta

• inferior vena cava

• umbilical artery

• superior vena cava

The umbilical cord contains two umbilical veins.

• True

• False

The ductus arteriosus allows fetal blood to bypass the lungs.

• True

• False

What extends from the embryo into the endometrium, contributing to the formation of the placenta?

• Mesoderm and endoderm

• Embryonic disc and trophoblast

• Chorionic villi

• Yolk sac and allantois

What is the function of repair enzymes?

• To correct free radical build-up

• To correct mutations that occur when DNA replicates

• To correct the degeneration of collagen and elastin

• To correct lipofuscin build-up

The theoretical maximum human life span is__________ years.

• 90

• 80

• 120

• 100