Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 43: Q. 22 (page 1259)

Progesterone is made during the third trimester by the: a. placenta b. endometrial lining c. chorion d. corpus luteum

Short Answer

Expert verified

The correct option is a. placenta

Step by step solution

01

Step 1. Given information

As the trimester progresses, the outer layer of the embryo begins to merge with the endometrium, and the placenta forms. This organ takes over the nutrient and waste requirements of the embryo and fetus, with the mother’s blood passing nutrients to the placenta and removing waste from it .

02

Step 2. Explanation

The correct option is a. placenta

The placenta has taken over the functions of nutrition and waste and the production of estrogen and progesterone from the corpus luteum, which has degenerated. The placenta will continue functioning up through the delivery of the baby

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

What do you think would happen if multiple sperm fused with one egg?

Why do mammalian eggs have a small concentration of yolk, while bird and reptile eggs have a large concentration of yolk?

Which of the following gives rise to the skin cells? a. ectoderm b. endoderm c. mesoderm d. none of the above

Figure 43.17 Which of the following statements about the menstrual cycle is false? a. Progesterone levels rise during the luteal phase of the ovarian cycle and the secretory phase of the uterine cycle. b. Menstruation occurs just after LH and FSH levels peak. c. Menstruation occurs after progesterone levels drop. d. Estrogen levels rise before ovulation, while progesterone levels rise after.

Why would paired external fertilization be preferable to group spawning?
See all solutions

Recommended explanations on Biology Textbooks

Communicable Diseases

Read Explanation

Plant Biology

Read Explanation

Organ Systems

Read Explanation

Heredity

Read Explanation

Genetic Information

Read Explanation

Cell Communication

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free