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Difficulty: EasyVertebrates: Homoiothermic Classes (Aves and Mammalia)

Which of the following anatomical features of the circulatory system is shared by both Aves (birds) and Mammalia (mammals) to support their homoiothermic nature?

  1. A four-chambered heart that completely prevents the mixing of oxygenated and deoxygenated bloodAnswer
  2. B
    A three-chambered heart with two atria and a single undivided ventricle
  3. C
    A two-chambered heart through which blood flows in a single circuit
  4. D
    A three-chambered heart containing an incomplete septum within the ventricle

Answer

A four-chambered heart that completely prevents the mixing of oxygenated and deoxygenated blood
Both birds (Aves) and mammals (Mammalia) are endothermic (homoiothermic) organisms requiring high oxygen delivery to generate and maintain internal body heat. Their hearts are fully divided into four chambers (two atria and two ventricles), ensuring complete separation of oxygenated and deoxygenated blood.

Step-by-Step Solution

1
Identify the metabolic requirements of homoiothermic organisms (birds and mammals).
Homoiotherms require efficient transport of oxygen to sustain high metabolic rates for internal heat generation.
Maintaining constant body temperature requires continuous cellular respiration supported by double circulation.
2
Determine the anatomical structure of the heart common to both Aves and Mammalia.
Both classes possess a completely divided four-chambered heart (two atria and two ventricles).
Complete ventricular separation prevents mixing of oxygenated and deoxygenated blood, maximizing oxygen delivery to body tissues.

Key Concept

Four-chambered heart structure and complete separation of blood in homoiothermic vertebrates
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Topics

Vertebrates: Homoiothermic Classes (Aves and Mammalia)

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