However, many other changes that are common with aging are due to modifiable factors.
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If not treated, these can lead to heart disease. The right side pumps blood to the lungs to receive oxygen and get rid of carbon dioxide.
The left side pumps oxygen-rich blood to the body. Blood flows out of the heart through arteries, which branch out and get smaller and smaller as they go into the tissues. In the tissues, they become tiny capillaries. Capillaries are where the blood gives up oxygen and nutrients to the tissues, and receives carbon dioxide and wastes back from the tissues.
Then, the vessels begin to collect together into larger and larger veins, which return blood to the heart. Some of the pathways of this system may develop fibrous tissue and fat deposits. The natural pacemaker the SA node loses some of its cells. These changes may result in a slightly slower heart rate.
A slight increase in the size of the heart, especially the left ventricle occurs in some people. The heart wall thickens, so the amount of blood that the chamber can hold may actually decrease despite the increased overall heart size.
The heart may fill more slowly. Heart changes cause the ECG of a normal, healthy older person to be slightly different than the ECG of a healthy younger adult.
Abnormal rhythms arrhythmiassuch as atrial fibrillationare more common in older people. They may be caused by heart disease. Normal changes in the heart include deposits of the "aging pigment," lipofuscin.
The heart muscle cells degenerate slightly. The valves 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. Blood vessels: Receptors called baroreceptors monitor the blood pressure and make changes to help maintain a fairly constant blood pressure when a person changes positions or is doing other activities. The baroreceptors become less sensitive with aging.
This may explain why many older people have orthostatic hypotension, a condition in which the blood pressure falls when a person goes from lying or sitting to standing. This causes dizziness because there is less blood flow to the brain. The capillary walls thicken slightly. This may cause a slightly slower rate of exchange of nutrients and wastes.
The main artery from the heart aorta becomes thicker, stiffer, and less flexible. This is probably related to changes in the connective tissue of the blood vessel wall. This makes the blood pressure higher and makes the heart work harder, which may lead to thickening of the heart muscle hypertrophy. The other arteries also thicken and stiffen.
In general, most older people have a moderate increase in blood pressure. Blood: The blood itself changes slightly with age. Normal aging causes a reduction in total body water.
As part of this, there is less fluid in the bloodstream, so blood volume decreases. The speed with which red blood cells are produced in response to stress or illness is reduced. This creates a slower response to blood loss and anemia. Most of the white blood cells stay at the same levels, although certain white blood cells important to immunity neutrophils decrease in their number and ability to fight off bacteria.
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This reduces the ability to resist infection. However, an older heart may not be able to pump blood as well when you make it work harder. Some of the things that make your heart work harder are: Certain medicines.
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