Almost all spices tend to have volatile aroma compounds and not flavor compounds like sugar, salt, acid, or glutamates. They may occasionally be bitter though. Aromas and taste work by different chemistries. Sugar, salt, citric acid, and MSG all have taste but not smell. Some foods like many fruits, have both fruity esters and essential oils, while also having sugars and acid which gives them both.
The sound of a heartbeat is caused by the heart valves opening and closing as they pump blood. When the heart is working properly, blood can only flow in one direction. The valves make this possible by opening and closing in exact coordination with the heartâs pumping action.
You know the one: lub-dub, lub-dub, lub-dub. Most of us think it's the sound of our heart beating or contracting, but it's not. What we're hearing is the sound of two pairs of valves closing inside the chambers of our heart. Like turnstiles, these valves allow blood to move in one direction through the heart and keep it from backing up down a one-way street.