The circulatory system, also known as the cardiovascular system, is a simple circuit that begins and ends in the heart. It is a closed system, which means that blood does not enter or leave the system as it travels from your heart to your body and vice versa. In such a system, a continuous flow of the same fluid can be pumped through the circuit over and over again.
Blood circulates throughout the body through the arterial system ( arteries , arterioles , and capillaries ) and returns to the heart through the venous system (veins and venules). Your blood is vital to your well-being and circulates nutrients, including electrolytes, oxygen, carbon dioxide, and amino acids throughout your body. Your heart is responsible for most of the functions of the circulatory system, and this is where the process begins.
Conversion begins in your heart
The circulatory system begins in your right atrium, the upper right chamber of your heart. Blood moves from the right side of the heart through the lungs to remove carbon dioxide and take in oxygen, and then returns to the left side of the heart, entering the left ventricle. The left ventricle is the strongest part of the heart, as it must pump blood to the rest of the body.
When it comes to circulating blood throughout the body, the left ventricle is the most important chamber of the heart. The left ventricle is the largest of the four chambers and is responsible for creating the force necessary to push blood out of the aorta, the first artery that blood enters when it leaves the heart.
From the aorta to the capillaries
Your blood travels from the aorta through a series of smaller blood vessels until it reaches your capillaries. However, before reaching the capillaries, the blood must pass through the arterioles, where its speed and pressure are constantly regulated, as different segments of the arterioles change in diameter in response to pressure and nearby chemical sensors. . These sensors regulate blood flow through your arterioles in response to changing conditions in your body.
Due to the action of the arterioles, when the blood reaches the capillaries, it no longer beats. Blood flows continuously through the capillaries, it does not "splash" or "stop" when your heart is beating. This continuous flow is necessary because there is a constant exchange of oxygen and nutrients in the capillary walls. Not a single cell in the body is far from the capillary.
Back to the heart and again
As the blood moves through the capillaries, the oxygen supply is reduced and waste products are collected. From the capillaries, the blood enters the venules and veins, and then returns to the heart to cool and exit again.
In conclusion, your heart functions as a pump that provides nutrients to all the organs, tissues, and cells of your body. In turn, your cells return waste products like carbon dioxide into your bloodstream to return to your heart.