The idea that blood vessels in the face send temperature information to the brain, affecting the emotion we feel, is known as the facial feedback hypothesis.
Facial feedback hypothesis states that the emotional experience is affected by the facial expressions of oneself. If an individual smiles, it can actually make him/her happy. The role of skeletal muscles if given prevalence in this hypothesis.
Blood vessels are the tube like structures that perform the functions of transporting blood to the entire body. They can carry blood from heart to the different organs and vice versa. There are three types of blood vessels: veins, arteries and capillaries.
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