You know that in order to live, we need to keep blood moving through our heart and throughout our body. Think of it like a powerful muscle, or rather a pump. It is what sends oxygen-rich blood throughout the body. After leaving the heart, this blood travels through many small blood vessels, which are like small roads, and goes everywhere from your head to your toes. Your blood is always on the move, never stopping in one place. As it travels, the blood has two main jobs to do.
Why is this blood circulation so important for our body?
Simply put, this blood flow is what provides the nutrients needed by every organ and tissue in our body.
- The first is to deliver oxygen and nutrients to every organ and tissue in your body. This is like bringing food and drink to your home.
- The second thing is to remove the carbon dioxide gas and other waste products that accumulate in those places, just like removing the garbage from your home.
So, when the oxygen is depleted and the waste is filled, this blood returns to the heart. After it reaches the heart, this blood needs to be cleaned, that is, it needs to be filled with oxygen again and carbon dioxide removed. That is why the heart sends this blood to the lungs. It is inside the lungs that this blood gets new oxygen and the waste is removed. This purified blood returns to the heart. The heart happily accepts this clean blood and pumps it again to the whole body.
In addition to carrying oxygen and nutrients, our blood has something else special. Those are cells that fight disease, we call them white blood cells. These white blood cells are what protect our bodies from germs. They travel throughout the body, fighting off any infection or foreign invaders.
This blood flow is continuous, every second, every hour of the day. Our heart and blood vessels work together to do all this. That's why we call this system the circulatory system . Like a smart delivery service that works at the right time, the parts of this circulatory system work together to move blood throughout the body in a timely manner.
Imagine, if something gets stuck in these blood vessels, for example , a blood clot , or if the blood flow is slow, this entire system can be disrupted and various diseases can occur. That's why it's important to know how blood flows inside your heart and throughout your body. Then you can do what you can to keep this powerful system that works inside you, invisible to you, healthy.
How does blood flow inside the heart?
Think of your heart as a four-chambered house. It has two chambers on the right side (the right atrium and the right ventricle) and two chambers on the left side (the left atrium and the left ventricle). Your blood flows through all four chambers – but not in a row.
Just like when you come home from a hard day at work, your blood travels throughout your body and returns to your heart. It first enters the upper right chamber of your heart, the right atrium. Then it goes straight from there to the lower right chamber, the right ventricle. It's like when you come home from the living room and go straight to the kitchen to eat something.
Blood from the right ventricle can't go straight to the two chambers on the left side of the heart. First, it has to go to the lungs to remove waste products and pick up some more oxygen. So the blood leaves the heart and goes to the lungs. It's like you run to the bathroom, do your chores, and then take a quick shower.
After leaving the lungs, the blood enters the upper chamber on the left side of the heart, the left atrium. From there, it flows into the lower chamber on the left side, the left ventricle. The left ventricle then pumps this blood to the rest of the body. It goes around the body and then comes back to the heart. It's like you go to bed, have a good night's sleep, wake up the next morning and go back to work.
What are Heart Valves?
Just as there are doors to the rooms in a house, there are doors to the rooms in your heart. These doors are called heart valves . They open and close at just the right time to control the flow of blood, and they keep blood flowing in only one direction. There are four main valves in your heart:
- Tricuspid valve: This is located between your right atrium and right ventricle.
- Pulmonary valve: This is located between the right ventricle and the main pulmonary artery that carries blood to the lungs.
- Mitral valve: This is located between the left atrium and the left ventricle.
- Aortic valve: This is located between the left ventricle and the aorta, the main artery that carries blood from the heart to the entire body.
What is the order in which blood flows through the heart, step by step?
The right and left sides of your heart work together to pump blood throughout your body. Blood flows through the heart in several steps. All of these steps happen in one heartbeat – a short period of time, about one or two seconds.
The event on the right side
1. Oxygen-poor blood from all over your body enters your right atrium through two large veins , the superior vena cava and the inferior vena cava . These veins take blood from the upper and lower parts of your body, respectively, and pump it directly into the right atrium.
2. Your tricuspid valve opens, allowing blood to flow from the right atrium to the right ventricle.
3. When the right ventricle fills with blood, it contracts. The tricuspid valve then closes and the pulmonary valve opens.
4. Blood flows through the main pulmonary artery and its branches to the lungs, where it receives oxygen and releases carbon dioxide.
Left side event
1. Oxygen-rich blood from the lungs enters your left atrium through large veins called the pulmonary veins . These veins pump blood directly into the left atrium.
2. Your mitral valve opens, sending blood from the left atrium to the left ventricle.
3. When the left ventricle fills with blood, it contracts. The mitral valve then closes and the aortic valve opens.
4. Your heart pumps blood through the aortic valve into the aorta , from where it flows to the rest of the body.
How much blood does your heart pump?
Did you know that your heart pumps about 2,000 gallons of blood a day? That's enough to fill an 8-foot-long, 10-foot-wide swimming pool.
Also, the heart beats about 100,000 times a day. On average, over a lifespan of about 79 years, your heart will beat about 2.9 billion times! Isn't that amazing?
What are the diseases that affect blood flow in the heart?
Some medical conditions can affect the blood flow to your heart. Here are some of the conditions:
- Arrhythmia: An irregular heartbeat. For example , atrial fibrillation or ventricular fibrillation .
- Congestive Heart Failure: Damage or weakness of the heart muscle makes it difficult for the heart to pump blood to the rest of the body.
- Coronary Artery Disease (CAD): The arteries that carry blood to the heart muscle become hardened and narrowed due to plaque buildup.
- Peripheral Artery Disease (PAD): The arteries that carry blood to other parts of the body become hardened and narrowed due to fatty deposits.
- Heart Attack: A sudden blockage of a coronary artery, resulting in the loss of oxygen to a portion of the heart muscle.
- Heart Valve Disease: A condition in which a heart valve does not work properly. For example, it may become narrowed or leaky.
- Structural Congenital Heart Defects: Problems with the structure of the heart that are present at birth. For example , Bicuspid Aortic Valve Disease .
- Sudden Cardiac Arrest: Sudden loss of heart function due to a malfunction in the heart's electrical system.
How to get blood flowing throughout the body, step by step?
Your heart pumps oxygenated blood through the aortic valve into the aorta . The aorta is the main artery in your body. It's like the main trunk of a large tree. Many branches branch off from this aorta, going to different parts of your body and to different organs.
Here's what happens after blood enters the aorta:
1. Blood flows from the aorta to other arteries (aortic branches) that branch directly off the aorta.
2. The first branches from the aorta are the coronary arteries . These are the ones that supply the heart muscle with blood.
3. As the aorta passes through the chest and abdomen, many other arteries branch off from it.
4. Finally, the aorta turns in a Y-shape near your belly button and divides into two final branches called the iliac arteries .
5. The branches of the aorta give off smaller branches, just like the branches of a tree. These arteries go to every corner of the body.
6. Blood flows from arteries into even smaller blood vessels called arterioles .
7. These arterioles connect to even smaller blood vessels called capillaries . The walls of the capillaries are very thin, allowing oxygen and nutrients to pass from the blood to the organs and tissues.
8. After delivering oxygen and nutrients and removing waste products, the capillaries connect to smaller blood vessels called venules .
9. Venules connect to veins . These veins carry the now oxygen-poor, waste-filled blood back to the heart.
10. Blood from all the veins in the body eventually joins two large veins called the superior vena cava and the inferior vena cava .
11. These two large veins carry blood directly to the right atrium of the heart. The blood then passes back through the heart and lungs, and begins to circulate throughout the body.
This system of blood circulating throughout your body is a very complex and amazing system. It operates 24 hours a day, whether you are awake or asleep. This constant flow of blood is what allows you to think, talk, move around, and interact with your environment.
What are the diseases that affect blood circulation in the body?
Various diseases of the circulatory system can interfere with the normal flow of blood throughout the body. For example, you may experience:
- Weak spots in the arterial walls (Aneurysms) .
- Fatty deposits inside the arteries (atherosclerosis) .
- Weakening or damage to the veins (Venous disease) .
- Abnormal connections between arteries and veins (Arteriovenous fistulae) .
Sometimes, you can prevent these conditions from occurring, or at least reduce your risk. But other times, when factors like heredity (that is, the genes you inherit from your parents) and aging play a role, there may not be much we can do about it.
However, while not all diseases that affect blood circulation can be prevented, you can talk to a doctor and manage any problems that arise, and prevent them from getting worse.
What can I do to keep my heart and body well-circulated?
Here are some things you can do to maintain a healthy blood flow:
- Maintain a healthy weight that suits you.
- Eat a heart-healthy diet. That means eating foods that are low in oil, salt, and sugar, and high in fruits and vegetables.
- Exercise for about 150 minutes a week. That's about 30 minutes a day, five days a week.
- Limit alcohol consumption.
- Manage stress. Use healthy methods like talk therapy or meditation.
- If you smoke or use other tobacco products, stop.
Imagine the view out the window as you prepare to land on a plane near a big city. A network of roads that connect and diverge from each other, a network of highways... cars in long lines, flowing one after another, all trying to get to their destination. Something just as hectic and busy is happening inside your body all the time, but on a much smaller scale - as blood moves through your heart and blood vessels.
Finally, take-home message:
These little things that happen inside our bodies are so small that we don't see them every day, so we can easily forget about them. But this constant flow of blood is what keeps us alive day after day. You don't need to know every detail about how it all works. But knowing a few basic things can help you talk to a doctor about any problems you may have, or just about ways to stay healthy. If you have any questions about your blood flow, or anything else in your health, or if you have any doubts, never hesitate to ask a doctor. Your health is the most valuable thing you have!
` Heart, blood flow, blood circulation, oxygen, heart disease, health, blood vessels
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