The Placenta

question 61

Multiple Choice

The placenta

• A) forms from endometrial and extraembryonic tissues.
• B) will cover about one-fourth of the inner uterine surface at full term.
• C) does not normally intermingle fetal blood with maternal blood.
• D) secretes progesterone and estrogens that maintain the uterine lining during the second and third trimesters.
• E) does all of these.

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Definitions:

Female Gametophyte

The haploid phase in the life cycle of plants and algae that produces female gametes or eggs.

Pine Life Cycle

The series of stages a pine tree undergoes from seed germination to maturity, reproduction, and eventually death.

Ginkgo

Member of phylum Ginkgophyta; maidenhair tree.

Gymnosperms

A group of seed-producing plants that includes conifers, cycads, Ginkgo, and gnetophytes, distinguished by having the seeds unprotected by an ovary.