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Parasympathetic nervous system area in the brain that monitors the heart rate and strength of contraction.  

Sympathetic nerve center that increases the heart rate and strength of contraction.  

The two lower heart chambers directly below the atrium, called right and left ventricles, respectively.  

Transient and sudden loss of consciousness due to inadequate cardiac output associated with bradycardia, tachycardia, or myocardial infarct. Syncope of cardiac origin as in Stokes-Adams syndrome, aortic stenosis, tachycardia, bradycardia, or myocardial infarction.  

Diagnostic study of the heart using an injection of a radioisotope and subsequent uptake by the myocardium, followed by imagery by a gamma camera of the heart beating; measures the volume of blood pumped by each ventricle.  

Battery of blood tests performed to determine the presence of cardiac damage by detecting the level of heart muscle enzymes.  

Pulsating, lateral movement of the trachea to one side. It may be present with thoracic aortic aneurysm.  

Spongy or lattice-like bone formation located in the epiphyses of developing bone. Spongy bone with many marrow cavities. It is present at the ends of long bones and in the interior of most flat bones.    

A self- limiting condition occurring in children between the ages of 2 and 12 years in which there is a necrosis of the ossification centers of bone followed by regeneration and recalcification. A narrow or tubular channel.  

A cup-shaped structure within an organ, such as the kidney.