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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332

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BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
ISBN: 9781337408332
Textbook Problem
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Which of the following has the thickest wall?

  1. a. left atrium
  2. b. left ventricle
  3. c. right atrium
  4. d. right ventricle

Summary Introduction

Concept introduction: The heart is a muscular pumping organ seen in almost all higher animal groups. It is made up of cardiac muscles that pump oxygenated blood through blood vessels to different body parts and in return it receives deoxygenated blood from the respective organs. In mammals, the heart is divided into four major compartments composed of two atria and two ventricles.

Explanation

Reason for correct answer: Heart is a muscular organ made up of thick cardiac muscles. Compared with the two atria, ventricles have the thickest walls as they are involved in pumping blood at a high pressure. Right ventricle pumps blood to lungs during pulmonary circulation and left ventricle to aorta during systemic circulation. As compared to right ventricle, left ventricle has the thickest wall as it produces a very high pressure upon systemic contraction that completely empties its blood to aortal vessel. Pumping the blood to aorta is not so easy. Therefore, left ventricular walls must be thicker than any other heart chambers.

Option b. is given as “left ventricle”. Since the left ventricular wall is the thickest among other three chambers of the heart, option b. is the correct answer...

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