They're in the heart, in the center of the chest cavity, often shifted slightly to the left.
Card/i means heart. Examples are cardiovascular (pertaining to the blood vessels and heart), myocardial (pertaining to the heart muscle), and cardiac (pertaining to the heart.)
Myocardium is the medical term meaning heart muscle.Cardiac Muscle.Cardiac muscleCardiac Muscle; there are only three types of muscles, cardiac ~ heart, smooth ~ intestines, stomach, etc, and skeletal =~the ones you use on your arms or legs; muscles attached to bones.It's name, as a muscle of the body, is the "myocardium".Cardiac (cardi = heart + ac = pertaining to) musclerefers the the specific type of muscle found in the heart. It is heavily striated, involuntary and has intercalated disks to aid with electrical transmission.Myocardium (myo = muscle + cardi = heart + um = noun form) is that layer of the heart devoted to the cardiac muscle.
Cardio means: pertaining to the heart. cardiac
Cardiothoracic means pertaining to the heart and lung cavity.
Cardiopulmonary means pertaining to the heart and lungs.Cardiopulmonary
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Cardiopulmonary
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The medical term meaning pertaining to within the heart is "intracardiac."
Your heart is a muscle. It is also called the myocardium. The muscle cells in the heart muscle are called myocardiocytes.
The word root for pertaining to the heart beat is "cardio-" which derives from the Greek word "kardia", meaning heart, and "pulse", meaning rhythm or beat.