Which avian organ is a muscular grinding chamber that may contain grit?

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Multiple Choice

Which avian organ is a muscular grinding chamber that may contain grit?

Explanation:
In birds, digestion includes a muscular chamber that serves as a grinding mill for food. After initial chemical digestion in the glandular stomach, the feed moves into the gizzard, a thick-walled, highly muscular organ that physically breaks down tough stuff. It often contains grit—small stones or sand—that the bird swallows to aid this grinding action, effectively replacing teeth. Other organs like the lungs, heart, or spleen have roles in respiration, circulation, and immune function, not mechanical grinding. So the organ described is the gizzard.

In birds, digestion includes a muscular chamber that serves as a grinding mill for food. After initial chemical digestion in the glandular stomach, the feed moves into the gizzard, a thick-walled, highly muscular organ that physically breaks down tough stuff. It often contains grit—small stones or sand—that the bird swallows to aid this grinding action, effectively replacing teeth. Other organs like the lungs, heart, or spleen have roles in respiration, circulation, and immune function, not mechanical grinding. So the organ described is the gizzard.

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