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Difficulty: HardVertebrates: Homoiothermic Classes (Aves and Mammalia)

In homoiothermic vertebrates, adult birds (Aves) retain the left systemic aortic arch to transport oxygenated blood from the heart to the body, whereas adult mammals (Mammalia) retain the right systemic aortic arch for the same functional role.

Answer: Answer

Answer

The statement is False because birds possess a persistent right systemic aortic arch, while mammals possess a persistent left systemic aortic arch.
The statement is false because it reverses the systemic aortic arch retention pattern between Aves and Mammalia. Birds possess a right systemic aortic arch, whereas mammals possess a left systemic aortic arch.

Step-by-Step Solution

1
Examine the aortic arch structure in class Aves (birds).
In birds, the fourth embryonic right aortic arch persists to form the right systemic aorta that arches over the right bronchus.
Identifying the persistent arch in birds confirms that their main arterial trunk curves to the right side.
2
Examine the aortic arch structure in class Mammalia (mammals).
In mammals, the fourth embryonic left aortic arch persists to form the left systemic aorta that arches over the left bronchus.
Identifying the persistent arch in mammals confirms that their main arterial trunk curves to the left side.
3
Evaluate the accuracy of the prompt statement against biological facts.
The statement incorrectly claims birds have a left aortic arch and mammals have a right aortic arch.
Reversing anatomical features between Aves and Mammalia makes the premise false.

Key Concept

Comparative circulatory anatomy of homoiothermic vertebrates (Aves vs Mammalia aortic arch orientation)
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Topics

Vertebrates: Homoiothermic Classes (Aves and Mammalia)

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