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.
Symptoms. In organic heart disease, there can be an inflammation of the heart and scar like formation .These scars can cause deformation of valves and thereby malfunction. The muscular tissue of the heart may become softened or stretched. All these conditions are called organic diseases of the heart.Enlargement of the heart is also a kind of organic heart disease. And can consist of stretched muscles of the heart. or hypertrophy.There are several ways heart disease may develop, through a sudden inflammation, or to some other form of infection; but generally the development is gradually.ymptoms. In organic heart disease, there can be an inflammation of the heart and scar like formation .These scars can cause deformation of valves and thereby malfunction. The muscular tissue of the heart may become softened or stretched. All these conditions are called organic diseases of the heart.