Lupus short for systemic lupus erythematosus (SLE).
M
macrovascular damage damage to arteries, arterioles (small arteries), and small vessels.
macula densa specialized cells in the kidney that control sodium balance.
malignant tumor the tumor that spreads to other organs.
maximal oxygen consumption the most oxygen that the body can use in aerobic exercise; synonymous with maximal aerobic fitness.
media the middle wall of the arteries.
metastases distant spread of cancer to various organs.
microvascular damage damage to capillaries.
mitochondria small spherical cytoplasmic organelles; mitochon¬dria are the principal sites of ATP synthesis and contain enzymes of the citric acid cycle for fatty acid oxidation, oxidative phosphorylation, and other biochemical pathways. They contain their own DNA and ribosomes, replicate independently, and synthesize some of their own proteins.
mitral regurgitation the mitral valve remains open when it should be completely shut; blood rushes backwards from the left ventricle into the left atrium.
monocytes white blood cells.
murmur a blowing sound heard with a stethoscope usually caused by obstruction of heart valves or leaking valves.
mutations a permanent transmissible change in the genetic material.

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