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Difficulty: EasyVertebrates: Homoiothermic Classes (Aves and Mammalia)

Both birds (Aves) and mammals (Mammalia) are homoiothermic vertebrates possessing a four-chambered heart that completely prevents the mixing of oxygenated and deoxygenated blood.

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Answer

True. Both Aves and Mammalia are homoiothermic animals equipped with a four-chambered heart that completely separates oxygenated and deoxygenated blood.
The statement is accurate because homoiothermic animals (birds and mammals) depend on efficient blood circulation to sustain elevated metabolic rates. Their four-chambered hearts ensure that oxygenated blood from the lungs is kept strictly isolated from deoxygenated blood returning from body tissues.

Step-by-Step Solution

1
Identify the physiological temperature regulation mechanism of Aves and Mammalia.
Both classes are homoiothermic (warm-blooded), maintaining a constant internal body temperature regardless of ambient environmental conditions.
Homoiothermy requires high cellular respiration and energy production, placing heavy demands on oxygen supply.
2
Examine the anatomical chamber division of the heart in Aves and Mammalia.
Both birds and mammals possess a four-chambered heart featuring two distinct atria and two distinct ventricles.
Complete ventricular septation ensures double circulation with zero mixing of deoxygenated blood returning from the body and oxygenated blood returning from the lungs.

Key Concept

Homoiothermy and four-chambered cardiac separation in Aves and Mammalia
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Topics

Vertebrates: Homoiothermic Classes (Aves and Mammalia)

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