radicals can attack cells. free radical scavenger a substance that removes or destroys
free radicals.
G
gynecomastia enlargement of the breast, usually seen in men.
H
HDL cholesterol high density lipid; the good cholesterol. heart the size of a closed fist, it lies within the chest cavity,
directly under the breastbone (sternum); the shape of the heart
is conical with the apex pointing downward to the left edge
of the diaphragm. heart failure failure of the heart to pump sufficient blood from
the chambers into the aorta; inadequate supply of blood
reaches organs and tissues. hemodynamics the study of the movement of blood and the
forces involved in the circulation of the blood. hemoglobin heme – ‘‘iron,’’ globin – ‘‘protein;’’ an iron-protein
substance present in red blood cells that carries oxygen to the
cells of the body. heterograft a graft of tissue taken from a donor of one species
and grafted into a recipient of another species, also called a
xenograft.
Holter monitor a machine, the size of a handbook, that is capable of recording 24–48 hr of continuous electrocardio-graphic monitoring; the tracing is used to assess abnormal heart rhythms, particularly serious arrhythmias.

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