Chapter 28.3, Problem 3MI

Summary Introduction

To define:

the given terms.

Introduction:

The terms given in the question are related to amphibians such as frogs, salamanders. These animals belong to the class Amphibia of the phylum Chordata. Amphibians are vertebrates that live both on land and water. They are the first cold-blooded animals to have appeared on land.

Explanation of Solution

The definition of the terms given in the table below:

Term	Definition
Cloaca	It is a chamber that receives the digestive wastes, urinary waste, and eggs or sperm before they leave the body. It is present in amphibians, reptiles, birds, fishes such as sharks and monotremes.
Nictitating membrane	It is a transparent or translucent eyelid present in some animals that can move across the eye to protect itunderwater and keep it from drying out on land. This membrane moistens the eye while maintaining vision.
Ectotherm	It is an animal that cannot regulate its body temperature. In these animals,internal physiological sources of heat are relatively small. They are called cold-blooded animals.
Tympanic membrane	It is a large external oval shape membrane made up of non-glandular skin in amphibians such as frogs. It is located just behind the eye. It does not process sound waves; it simply transmits them to the inner part of the ear.