A Complete Collection of 100000 Whys
Fav十万个为什么
为什么捂住耳朵能听见心跳？
简单的摘要：捂住耳朵能听见心跳的原因主要是隔绝外部噪音、增强体内声音传导以及减少声音分散。
1、捂住耳朵可以隔绝外部的噪音，使得外部环境的声音无法进入耳道。这种隔音效果使得原本被外部噪音掩盖的体内声音，如心跳声，变得更加明显。
2、捂住耳朵后，声音可以通过头骨和身体组织直接传导到听觉神经，这种方式被称为骨传导。骨传导的声音损失较小，因此心跳声等体内声音通过骨传导变得更加清晰。
3、捂住耳朵减少了声音在空气中的分散，使得声音能量更加集中地传导到耳朵。这种减少分散的效果增强了声音的强度，使得心跳声等微弱的体内声音更容易被听见。
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