Thyroid hormone is very important for normal cardiovascular function. 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.
Conversion is the act or process of changing something into a different state or form. ...the conversion of disused rail lines into cycle routes. A loft conversion can add considerably to the value of a house.
1 : an act, process, or instance of translating: such asa : a rendering from one language into another; also : the product of such a renderingb : a change to a different substance, form, or appearance : conversionc (1) : a transformation of coordinates in which the new axes are parallel to the old ones (2) : uniform motion of a body in a straight ...