उल्टी से बदबू क्यों आती है?

जैसा कि सर्वविदित है, ब्यूटिरिक एसिड ही उल्टी को वह विशिष्ट, एक मील दूर से सूंघने वाली गंध देता है। और यही कारण है कि हम इसे पहचानने में इतने अच्छे हैं। मनुष्य इसे 10 भाग प्रति मिलियन तक पहचान सकता है।

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