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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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In ______, blood flows through a single circuit.

  1. a. fishes
  2. b. amphibians
  3. c. birds
  4. d. mammals

Summary Introduction

Concept introduction: A circulatory system composed of a huge network of organs and blood vessels that are responsible for the continuous flow of blood, essential nutrients, and oxygen to and from cells. The complexity of the system varies in different groups of animals ranging from an open circulatory system to a very systematic closed system.

Explanation

Reason for correct answer: The circulatory system of fish is composed of a heart and the blood vessels arising from it. Here, the heart is double chambered that is it has one atrium and one ventricle. The blood passes through the heart only once on each circuit around the whole blood system of the body. The atrium always receives deoxygenated blood from all body parts and which then pumped into ventricle from where it goes to the gills. As gills perform the function imposed on lungs in mammals, it is in the gills of fish that deoxygenated blood gets oxygenated.

Option a. is given as “fishes”. In fishes, for completing a circuit, blood passes through the heart only once. Therefore, option a. is the correct answer.

Reason for incorrect answers:

Option b...

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