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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem

The ________, a fluid-filled sac, surrounds and protects a human embryo and keeps it from drying out.

  1. a. amnion
  2. b. yolk sac
  3. c. allantois
  4. d. chorion

Summary Introduction

Concept introduction: The placental mammals are amniotes. The amnion is the extraembryonic membrane that covers the embryo during development to suit the terrestrial mode of life. The amnion acts as a cushion for the embryo and protects it from the mechanical shocks and injury.

Explanation

Reasons for the correct statement:

The blastocyst is implanted in the uterus. The extraembryonic membranes form around it. The amnion is one such layer. The outermost cell layer of the blastula gives rise to the amnion and chorion. The amnion encloses the embryo and is fluid-filled that ensures that the embryo doesn’t dry out.

Option a. is given as “amnion”

As the amnion is the extraembryonic membrane that is a fluid-filled sac inside which the embryo resides and protects the embryo from drying out, option a. is correct.

Reasons for the incorrect statements:

Option b. is given as “allantois”...

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