Biology
Biology
4th Edition
ISBN: 9781259188121
Author: Peter Stiling, Robert Brooker, Linda Graham, Eric Widmaier
Publisher: McGraw-Hill Education
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Chapter 45, Problem 2CQ
Summary Introduction

To determine: The functions of the crop and gizzards in birds.

Introduction: The stomach of birds is divided into two parts: the proventriculus and the gizzard. Gizzard is a muscular structure which contains a rough inner lining. Some animals contain crop which is a storage organ. Crop is a dilation of the lower part of esophagus.

Summary Introduction

To determine: The reason that humans do not have crop or gizzard.

Introduction: Birds contain gizzard which is useful for grinding food into smaller fragments. Crop is a dilated part of lower esophagus which is found in most birds and in some invertebrates.

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