Question: People say that when they see someone they love their heart beats faster? is this true? and how is it linked to biology science exactly??

Vicky Young answered on 15 Mar 2012:

Yes its true.

Your heart beats faster because it is stimulated by the hormone adrenaline which is produced when you are afraid or stressed or nervous. This hormone is responsible for making your heart beat faster, speeding up your breathing (to give extra oxygen to your muscles) and diverting blood from your digestive system to your muscles (for the same reason). This is the reason why you may also experience “butterflies” in your stomach.

As well as your heart beating faster your pupils become bigger. This is because you want to see this person very clearly and so your pupils become bigger to let in more light when you are looking at them!