Some nebulae create their own light, which sometimes has a fluorescent appearance, while others only reflect the light from nearby stars. Nebulae are often seen around dying stars, and it's thought they may be a natural process that occurs when a star is nearing the end of its life. Nebulae resemble thin clouds that have less atoms per cubic inch than a cloud of smoke.
When there is not enough thyroid hormone, neither the heart nor the blood vessels can function normally. In hypothyroidism, the reduced level of thyroid hormone causes the heart muscle to pump less vigorously, and eventually to become weakened. In addition, the heart muscle cannot fully relax after each heart beat.
When the heart muscles are abnormally thick, it makes it very difficult for the heart to pump blood. This condition that causes thickening of the heart muscles, is called hypertrophic cardiomyopathy (HCM).Many times, this condition goes unnoticed because a few handful people develop few or no symptoms related to this condition.hese valves are distorted due the abnormal thickening of the cardiac muscles in the ventricles. Dilated cardiomyopathy: One of the main causes of heart failure is dilated cardiomyopathy. This condition occurs due to the overexertion of the thickened heart muscle.