The findings of matthews' research into the connection between type-a personalities and heart disease was Hostility was the sole factor that predicted death from heart disease.
A fist-sized organ, the heart circulates blood throughout your body. It serves as your circulatory system's main organ. Four major muscle-driven chambers make up your heart; they are each powered by electrical impulses. Your nerve system and brain control how your heart beats.
It is the muscle that your circulatory system depends on to pump blood throughout your body while your heart beats. All of your body's parts receive oxygen and nutrition from this blood, which also removes waste materials and excess carbon dioxide.
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