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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 24, Problem 7SQ
Textbook Problem
5 views

Annelids and ______ have a closed circulatory system.

  1. a. insects
  2. b. cephalopods
  3. c. flatworms
  4. d. sea stars

Summary Introduction

Concept introduction: Circulatory system helps to transport molecules and other substances from one system to another and also helps in gaseous exchange. Open and closed circulatory systems are two types of circulatory system. The open circulatory system has no difference between blood and interstitial fluid rather a common fluid is present called as hemolymph. The cells are directly bathed in blood unlike closed circulatory system where capillaries supply blood to the cells. In closed circulatory system, interstitial fluid and blood runs in two different tubes. The components of the blood and the system of arrangement of tubes differ between phyla.

Explanation of Solution

Reasons for correct statement:

Annelids and vertebrates have closed circulatory system. The mollusks have open circulatory system. Exception is the cephalopods that have closed circulatory system. The annelids have heart, blood vessels and hemoglobin or chlorocruorin for exchange of gases. The cephalopods have closed circulatory system with heart, blood vessels and have hemocyanin for exchange of gases.

Option b. is given as “cephalopods”

As annelids and cephalopods have closed circulatory system with heart and blood vessels, option b. is correct.

Reasons for the incorrect statements:

Option a...

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