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Zorluk: OrtaCirculatory and Transport Systems in Animals

In comparative vertebrate anatomy, which of the following groups possesses a circulatory system in which oxygenated blood from the lungs and deoxygenated blood from the body tissues enter two separate atria, but are subsequently pumped through a single, undivided ventricle?

  1. AmphibiansCevap
  2. B
    Bony fishes
  3. C
    Birds
  4. D
    Mammals

Cevap

Amphibians possess a three-chambered heart made up of two distinct atria and one single ventricle.
Amphibians feature a three-chambered heart comprising two separate atria (left and right) and one undivided ventricle. Deoxygenated blood returns from systemic tissues into the right atrium, while oxygenated blood returns from the lungs and skin into the left atrium. Both streams flow into the common ventricle before being pumped out.

Adım Adım Çözüm

1
Analyze the structural organization of vertebrate heart chambers across main taxonomic groups.
Fishes have 2 chambers (1 atrium, 1 ventricle); Amphibians have 3 chambers (2 atria, 1 ventricle); Reptiles have 3 chambers with an incomplete septum (except crocodilians); Birds and Mammals have 4 chambers (2 atria, 2 ventricles).
Identifying chamber counts establishes how blood flows through the heart in each class.
2
Determine the pathway of blood entering the heart in amphibians.
Deoxygenated blood from the body enters the right atrium, while oxygenated blood from the lungs and skin enters the left atrium. Both atria then empty into a single shared ventricle.
This two-atria, single-ventricle configuration results in incomplete separation of systemic and pulmonary blood flow.

Anahtar Kavram

Comparative Vertebrate Cardiac Anatomy and Blood Circulation Pathways
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Konular

Circulatory and Transport Systems in Animals

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