The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

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Chapter 21, Problem 5TY

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The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

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Which of the following statements is incorrect?a. The placenta secretes hormones such as progesterone, hCG, and estrogen.b. Embryonic tissue and maternal tissue forms the placenta.c. The chorion supplies nutrients to the embryo by diffusion.d. The umbilical cord is formed by one artery and two veins

During morphogenesis, gastrulation does which of the following?A. Gastrulation produces the ectoderm through formation of a blastocyst.B. Gastrulation produces the mesoderm to form the lining of the digestive tract.C. Gastrulation provides the mechanisms whereby cells can form the neural tube.D. Gastrulation produces the endoderm through invagination of the blastula.

Which of the following is false? a. The endoderm, mesoderm, ectoderm are germ layers. b. The trophoblast is a germ layer. c. The inner cell mass is a source of embryonic stem cells. d. The blastula is often a hollow ball of cells.

Answer 2

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Chapter 21, Problem 5TY

Summary Introduction

Introduction:

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

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Answer 3

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Chapter 21, Problem 5TY

Summary Introduction

Introduction:

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

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Answer 4

Question

Chapter 21, Problem 5TY

Summary Introduction

Introduction:

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

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Answer 5

Chapter 21, Problem 5TY

Summary Introduction

Introduction:

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

Answer 6

Chapter 21, Problem 5TY

Summary Introduction

Introduction:

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

Answer 7

Chapter 21, Problem 5TY

Summary Introduction

Introduction:

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

Answer 8

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Answer 11

Ch. 21 - Prob. 1QC Ch. 21 - Prob. 2QC Ch. 21 - 1. Why does only one sperm fertilize the egg, and...Ch. 21 - Prob. 2CR Ch. 21 - Prob. 3CR Ch. 21 - Describe the stages of labor and delivery.Ch. 21 - What causes the newborn to take its first breath...Ch. 21 - Prob. 6CR Ch. 21 - What causes the onset of puberty (sexual...Ch. 21 - Summarize the three main hypotheses of the causes...

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

Solution Summary: The author states that the correct order of pre-embryonic developmental stages is morula, blastocyst, and embryonic disk.

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Introduction:

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

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Chapter 21 Solutions

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

Solution Summary: The author states that the correct order of pre-embryonic developmental stages is morula, blastocyst, and embryonic disk.

Videos

Introduction: The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.

Want to see the full answer?

Chapter 21 Solutions

Introduction:

The growth period of an individual before its birth is divided into three stages. These are pre-embryonic, embryonic, and fetal development. During the pre-embryonic stage, the embryo is known as pre-embryo.