A Complete Collection of 100000 Whys
Fav十万个为什么
为什么蛤、蚌里会长珍珠？
蛤、蚌里会长珍珠，主要是因为外套膜受到异物（如寄生虫或沙粒）刺激后，会分泌珍珠质包裹异物，长期积累形成珍珠。
1、异物的刺激：当寄生虫、沙粒等异物进入蛤、蚌壳内时，会刺激其柔软的外套膜，引发防御反应。
2、珍珠质的分泌：为了减轻异物带来的不适，蛤、蚌的外套膜会加速分泌珍珠质（一种碳酸钙为主的物质），将异物包裹起来。
3、珍珠的形成：随着珍珠质不断包裹异物，逐渐形成珍珠囊，经过长时间的积累，最终形成珍珠。
总结：蛤、蚌里会长珍珠，主要是因为外套膜受到异物（如寄生虫或沙粒）刺激后，会分泌珍珠质包裹异物，长期积累形成珍珠。
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