If squeezed a tennis ball as hard as you could, you'd be using about the same amount of force your heart uses to pump blood throughout the body. Even during their very short rests, the muscles of the heart work about twice as hard as the leg muscles of a runner.
Location. Now, at this moment, put your hand on your heart. Aha! Like most people, you probably placed your hand on the left side of your chest. The heart is actually located almost in the center of the chest, between the lungs. It's tipped slightly so that a part of it sticks out and taps against the left side of the chest, which is what makes it seem as though it is located there.
Size. The adult's heart is about the size of both of your fists. The child's heart is about the size of one their fists.
The heartbeat. The beating that you hear through a stethoscope is described by physicians as being lub-DUB. These two sounds are made by the four main heart valves opening and closing. The valves close and open in pairs. When a heart is not functioning within normal parameters, there may be extra beats or sounds between the beats.
The Italians have a musical notation not found in any other language: 'tempo giusto 'the right tempo.' It means a steady, normal heat, between 66 and 76 on the metronome. Tempo giusto is the appropriate heat of the human heart.
Blood vessels. The largest artery in the body, the aorta, is just about the diameter of a garden hose. If you lie very still on your back, you may be able to detect its pulsations in your solar plexus area. Capillaries, on the other hand, are so small that it takes ten of them to equal the thickness of a human hair.
Your body contains about 6 quarts of blood, which circulates through the body three times per minute. In a single day, the blood will travel about 12,000 miles. That's about two round-trips from New York to San Francisco, the distance across the US from coast to coast.
You can prove that you are alive! You can feel your pulse by placing two fingers at pulse points on the side of your neck or wrists. The pulse beat you feel is the beating of the heart causing the blood to stop and start as it moves through your arteries. A child's resting pulse might range from 90 to 120 beats per minute. An adult's pulse ranges an average of 72 beats per minute, and lower for athletes.
Your heart is designed to last a lifetime, but you have to do your bit to help ensure it stays in good working order. Everyone knows that exercising, not smoking, eating a healthy diet and staying slim promote good heart health. But you've also got to have the right attitude. Best to follow the advice given in an old Frank Sinatra song,
Fairy tales can come true
It can happen to you
If you're young at heart…
For it's hard you will find
To be narrow of mind
If you're young at heart… |