suggest a changes in circulatory system
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Explanation:With increasing age, all the structures of the heart also become more rigid. The muscles of the left ventricle get thicker, the heart may increase slightly in size, and the volume of the left ventricle may decline. As a result, the heart may both fill and empty more slowly, thus putting less blood into circulation.
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Normal changes in heart include deposits of the "aging pigment ", lipofuscin. The heart muscle cells degenerate slightly. The values inside the heart, which control the direction of blood flow, thicken and become stiffer.
A heart murmur caused by valve stiffness is fairly common in older people.
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