Everybody loves to laugh. Humans laugh an average 17 times per day but what is laughter what make it happen and how does it affect us.

Laughter is the expression of mirth pleasure, derision, or nervousness with a vocal exclusive of air from the lungs accompanied by characteristics facial and bodily movements. So what makes this vocal expulsion occur according to study it’s a neutral reaction generated by a synaptic relation in the reticular.

Heres how it actually works the frontal lobe of the brain is responsible for emotional responses the left side of the brain is responsible for interpreting the words and the structure of a joke and the right side is responsible of identifying what makes it funny and the limbic system is also important this area includes the amygdala and the hippocampus and its involvement in basic responses like fear or hunger the motor areas of the brain become active and these are the areas that actually produce the chuckle or the physical action of laughing .

Do Animal laughs

It's fun to imagine – and easy to assume -- that animals share our human emotions. But it's recently been documented that some animals do indeed share a very human trait. Humans are one of the only species on the planet that laughs although some scientists have observed laughter in primates during tickling.

Dogs seem to recognize and associate the "laugh" with pleasure. When Simonet played the recording to other dogs, some would seek out toys and others would "play-bow" toward the source. These positive effects were observed in puppies as well as adult dogs.

Don't feel bad if you've never noticed your dog – or your chimpanzee, for that matter – laughing. The sound credited as laughter in these species is much breathier than that of human laughter and more similar to a panting sound than a full-blown guffaw.

Laughter could lower the chance of Heart attack

Research shows that hostility, anger, depression, anxiety and social isolation all lead to higher rates of heart disease.

The reverse is true as well: Laughter, happiness and a sense of humor actually can help you to stay healthy. Research suggests laughter can decrease stress hormones, reduce artery inflammation and increase HDL, the “good” cholesterol. Research says that laughing regularly can even reduce your risk for a heart attack.

Laughter to the healthy function of blood vessels that could lower the chance of heart attack.

Laughter can strengthen the immune system

Laughter boosts your heart rate and increases the production of antibodies that strengthen your immune system and according to study laughing is contagious the sound of it provokes more laughter that’s sitcoms use laugh tracks the sound of laughter subconsciously makes us think that whatever is happening is funny.

Laughter is healthy we need it to survive so keep laughing it could save your life.