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.
The distinctive sound of the heartbeat-lub-dub, lub-dub, lub-dub comes from the closure of two pairs of heart valves. The valves are like doors. They open to allow blood to move in one direction and close to keep blood from backing up. The first sound results from closure of the mitral and tricuspid valves, which separate the upper and lower chambers of the heart. The second sound occurs as a result of closure of the pulmonic and aortic valves.