The heart is a fundamental muscle! The average heart beats 72 times per minute, and around 1,900 lbs. of blood is pumped each day. That's a lot of work on one muscle, so how does a muscle the size of two fists do all this work?
The heart is located between the lugs and behind the breast bone. Two-thirds of the heart lies to the left side of the midline of the body and about one-third to the right side. The heart appears as a cone shaped hollow mass. The heart is a double pump, and is made up of cardiac muscles. It pumps the blood throughout out the body by following a repeated rhythmic contraction pattern. Timing is extremely important.
The Heart in Action
Blood is pumped by the hearty in two different circuits. The first circuits in the systemic circuit and the second circuit is the pulmonary circuit. The system circuit starts at the left atrium and passes the mitral valve down into the left ventricle. The ventricle will contract after the atria have started relaxing by the closing of the atrioventricular valves, so blood does not back wash. Pressure will then become higher in the left ventricle allowing ventricular systole's second phase to begin. It begins by forcing blood through the aortic semilunar valve up into the aorta so blood may reach the rest of the tissue in the body. After this the ventricles will become relaxed and pressure is now higher in the aorta then it is within the ventricles and it will cause back flow of blood. During this blood will slowly return back into the left atrium by ventricular diastole second phase.
Blood will travel through arteries then to arterioles and lastly to capillaries so it can begin a gas exchange of oxygenated blood to the tissues to unoxygenated blood back to the heart.
The next step is the pulmonary circuit. The pulmonary circuit will return the deoxygenated blood into the right atrium and the superior vena cava down the tricuspid valve to the right ventricle and blood will be forced up into the pulmonary trunk.
It will then travel towards the lungs, the ateries then arterioles and capillaries once again but this time the capillaries with run along aveoli which are air sac's of the lungs that control the gas exchange between our atmosphere's. Basically so as you breath out you are going to be releasing the carbon dioxide from the tissues that were collected from those veins and transported via the arteries . As you breath in, oxygen will be inhaled back into the aveoli and will now allow oxygenated blood to return it back into the pulmonary venules. To the pulmonary veins so it can return back to the heart so the process can begin again.
Although this is a very complicated process it occurs every day, if the heart makes one mistake then a patient may result into having a serious heart condition. If you have any questions please comment below!
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