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Difficulty: EasyVertebrates: Poikilothermic Classes (Pisces, Amphibia, Reptilia)

Which of the following heart chamber configurations is characteristic of an adult amphibian, such as a toad?

  1. Three chambers consisting of two atria and one ventricleAnswer
  2. B
    Two chambers consisting of one atrium and one ventricle
  3. C
    Four chambers consisting of two completely separated atria and two ventricles
  4. D
    Single continuous chamber without internal divisions

Answer

Three chambers consisting of two atria and one ventricle
Adult amphibians have a three-chambered heart comprising two receiving chambers (left and right atria) and one pumping chamber (a single ventricle).

Step-by-Step Solution

1
Identify the taxonomic class of the organism referenced in the question.
Toads belong to Class Amphibia.
Determining the vertebrate class dictates the structural arrangement of the circulatory system.
2
Recall the cardiac structure typical of Class Amphibia.
Amphibians have a three-chambered heart composed of two atria (left and right) and a single ventricle.
Deoxygenated blood from the body enters the right atrium while oxygenated blood from lungs/skin enters the left atrium, both emptying into the single ventricle.

Key Concept

Vertebrate cardiac anatomical variation across poikilothermic classes
Estimated Time:45s
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Topics

Vertebrates: Poikilothermic Classes (Pisces, Amphibia, Reptilia)

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