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How is it that in the gizzard its lining...

How is it that in the gizzard its lining is not damaged while the soil containing sand particles is ground up?

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The gizzard is surrounded by thick layers of circular muscles. Its internal wall gives out six hard chitinous plates, called teeth or proventricular plates which masticate the food.
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ICSE-STRUCTURAL ORGANISATION IN ANIMALS -Test Your Progress (Short/Long Answer Type Questions )
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  7. Enumerate the physiological properties of heart (cardiac) muscles.

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  8. Enumerate the general functions of blood.

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  11. Draw a neat and labelled diagram of a neuron.

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  13. How is a male cockroach distinguished from a female cockroach?

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  14. How is it that in the gizzard its lining is not damaged while the soi...

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  17. Describe in brief the mouth parts of cockroach.

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