Chromosomas consist of genes. Gene determine all the characteristics of living things. 

Some genes have switches that can turn on or off to affect characteristics sometimes and not other times. Sometimes  gene switches get stuck in one position. This may be caused by saprophytic plant toxins (yeast, slime mold, and/or mildew toxins) in quantities of billionths of a gram; synthetic organic chemical toxins; and /or pharmaceutical drugs. Also, it could be caused by inherited tendencies. Tendecies for certain gene switching problems are sometimes inherited. For example, one family has had skin problems due to faulty switching of the toxin-absorption inhibiting genes for many generations.

These genes switches affect the function of the cardiovascular system. Per example:
*Blood pressure is controlled by three gene switches.
*Arteriosclerosis formation is inhibited by three gene switches.
*Toxin-absorption inhibition is controlled by three gene switches.
*Inflammation is controlled by two gene switches.