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Chapter 28: Q. 21 (page 776)

The circulatory fluid in echinoderms is _____.

a. blood

b. mesohyl

c. water

d. saline

Short Answer

Expert verified

Option c is the correct answer.

Step by step solution

01

Introduction

A phyla Echinodermata, which includes sea urchins, sea stars, sand dollars, sea cucumbers, and brittle stars, are distinguished by their prickly skin.

02

The explanation for the correct answer.

A central ring canal and radial canals that run along each arm make up the distinctive ambulacral or water vascular system that is found in echinoderms. These structures' water circulation promotes gaseous exchange, as well as nourishment, predation, and movement.

03

The explanation for the incorrect options.

  • In humans and other animals, the circulatory fluid is blood, however, in echinoderms, it is not.
  • Instead of being a circulatory fluid, mesohyl is a gel found in sponges that contains suspended cells that serve a variety of purposes.
  • Animal circulatory fluids do not include saline.

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Most popular questions from this chapter

The rhynchocoel is a ________.

a. circulatory system

b. fluid-filled cavity

c. primitive excretory system

d. proboscis

Echinoderms have _____.

a. triangular symmetry

b. radial symmetry

c. hexagonal symmetry

d. pentaradial symmetry

How do terrestrial arthropods of the subphylum Hexapoda impact the world鈥檚 food supply? Provide at least two positives and two negative effects.

Describe the feeding mechanism of sponges and identify how it is different from other animals

Which group of flatworms are primarily ectoparasites of fish?

a. monogeneans

b. trematodes

c. cestodes

d. turbellarians
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