Did you know that in order to live, we need to keep blood circulating through our heart and throughout our body? Yes, that's true. Our heart is like a powerful pump, which pumps clean, oxygenated blood throughout our body. So, this blood circulation is essential for our life. Today, we will talk in some detail about this very important process, that is, how blood circulates in our body.
Why is it so important to have blood flowing through our heart and throughout our body?
Think about it, every little part of your body, from your head to your toes, needs things to survive. It's the blood that carries those things and removes the unwanted stuff. Simply put, as our blood travels throughout our bodies, it does two main things:
- It carries oxygen and nutrients to all of our organs and tissues, like a food distributor.
- Also, it removes carbon dioxide gas and other waste products that accumulate in those places, just like someone who takes out the garbage.
After going through the body in this way, the blood returns to the heart when it is depleted of oxygen and filled with waste products. The heart then sends the blood to the lungs to be cleaned. It is in the lungs that the blood receives oxygen again and carbon dioxide is removed. The blood, which has been cleaned in this way, returns to the heart and is pumped from the heart to the entire body.
In addition to providing oxygen and nutrition, our blood has something else special. Those are little soldiers called White Blood Cells . These soldiers protect us by fighting off disease-causing germs that enter our bodies. They travel throughout the body with the blood, waiting for germs to arrive.
This blood journey is something that happens continuously, every second of the day. It's like a smart delivery service that works non-stop. Our heart and blood vessels work together to carry out this entire process. We call this system the Circulatory System .
However, if there is any blockage in these blood vessels, such as a blood clot , or if the blood flow is slow, various diseases can occur. Therefore, it is very important to know about how this blood flows. Then we can help keep this amazing, invisible system healthy.
How does blood move inside the heart?
Think of our heart as a house with four rooms. There are two rooms on the right side (the right atrium and the right ventricle) and two rooms on the left side (the left atrium and the left ventricle). Our blood travels through all four rooms, but not in a row.
Imagine you come home from a long day at work, and the blood that has been traveling throughout your body, depleted of oxygen, enters the right side of your heart. It first enters the right atrium . From there, it goes directly to the right ventricle . It's like coming home from the living room and going straight to the kitchen to eat something.
The 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, get rid of the waste products, and pick up new oxygen. So, the blood leaves the heart and goes to the lungs. It's like you go to the bathroom, do your chores, and take a quick shower.
After picking up oxygen from the lungs, the blood enters the left side of the heart. It first enters a chamber called the Left Atrium . From there, it goes directly below to the Left Ventricle . The left ventricle then pumps this clean, oxygen-rich blood to the rest of the body. It's like you go to bed, get a good night's sleep, and then go back to work the next day.
The doors of the heart – Heart Valves
I said that the heart is like a house, and the rooms in that house have doors. There are doors between the chambers of the heart and where blood flows out of the chambers. These are called heart valves . These valves open and close, allowing blood to flow in only one direction, exactly. There are four main valves in our heart:
- Tricuspid Valve: This is located between the right atrium and the right ventricle.
- Pulmonary Valve: This is located between the right ventricle and the main blood vessel that carries blood to the lungs (pulmonary artery).
- Mitral valve : This is located between the left atrium and the left ventricle.
- Aortic Valve: This is located between the left ventricle and the main blood vessel that carries blood to the body (the aorta).
The order in which blood flows through the heart, step by step
The right and left sides of our heart work together to pump blood throughout the body. It's amazing to think that all of this happens in one heartbeat, within a second or two!
What's happening on the right:
1. Deoxygenated (poor) blood collected from all over the body enters the right atrium of the heart through two large veins called the Superior Vena Cava and the Inferior Vena Cava . The superior vein brings blood from the upper parts of the body, and the inferior vein brings blood from the lower parts of the body.
2. When the right atrium fills with blood, the tricuspid valve opens and blood flows into the right ventricle .
3. When the right ventricle fills with blood, it contracts strongly. The tricuspid valve then closes and the pulmonary valve opens.
4. Blood travels through the pulmonary artery and its branches to the lungs, where it receives oxygen and releases carbon dioxide.
What happens on the left:
1. Blood, which has been oxygenated (purified) in the lungs, enters the left atrium of the heart through large blood vessels called the pulmonary veins .
2. When the left atrium fills with blood, the mitral valve opens and blood flows into the left ventricle .
3. When the left ventricle fills with blood, it also contracts strongly. The mitral valve then closes and the aortic valve opens.
4. The heart pumps this clean blood through the aortic valve into the aorta , from where the blood is distributed throughout the body.
Isn't it amazing? All of this happens in one breath, without us even realizing it!
How much blood does our heart pump?
Did you know that your heart pumps about 2,000 gallons of blood a day! That's enough blood to fill an 8-foot-long, 10-foot-wide swimming pool.
Also, the heart beats about 100,000 times a day. The heart of a person who lives an average life span of 79 years beats about 2.9 billion times! It's incredible, isn't it?
What are the diseases that affect blood flow in the heart?
Some medical conditions can disrupt this blood flow in the heart. Here are a few examples:
- Arrhythmia: An irregular heartbeat. For example , atrial fibrillation or ventricular fibrillation .
- Congestive Heart Failure: The heart is unable to pump blood properly due to weakness or damage to the heart muscle.
- Coronary Artery Disease (CAD): Fatty deposits (plaque) in the arteries that supply blood to the heart cause them to harden and narrow.
- Peripheral Artery Disease (PAD): Fatty deposits build up in the arteries that supply blood to other parts of the body, causing them to harden and narrow.
- Heart Attack: A sudden blockage of a coronary artery, causing a portion of the heart muscle to be deprived of oxygen.
- Heart Valve Disease: A condition in which a heart valve does not function properly. For example, the valve becomes narrow or leaks blood.
- 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 cessation of heart function due to a defect in the heart's electrical system.
How does blood travel throughout the body, step by step?
Oxygen-rich blood is pumped from the heart through the aortic valve into the aorta , where it is distributed throughout the body. This aorta is like the main trunk of a large tree. It branches out in different directions, carrying blood to all parts of the body.
Here's how blood travels after entering the aorta:
1. Blood flows directly from the aorta to other arteries (aortic branches).
2. The first branches that branch off from the aorta are the coronary arteries . These are the ones that supply the heart muscle with nutrients.
3. As the aorta passes through the chest and down through the abdomen, many other arteries branch off from it.
4. Finally, the aorta, like an upside-down Y near the pelvis, divides into two main branches. These are called the iliac arteries .
5. The aorta branches into smaller branches, like the branches of a tree. These arteries are spread throughout the body.
6. Blood flows from these arteries into arterioles, which are smaller blood vessels.
7. Microarteries connect to even smaller blood vessels called capillaries . The walls of these capillaries are very thin. This makes it easier for oxygen and nutrients to pass from the blood to the organs and tissues, and for waste products to pass back into the blood.
8. After delivering oxygen and nutrients and removing waste products, the capillaries join together into tiny blood vessels called venules .
9. The small veins join together to form large veins . These veins are the ones that carry the now oxygen-poor and waste-filled blood back to the heart.
10. Blood collected from veins throughout the body finally joins two large veins called the Superior Vena Cava and the Inferior Vena Cava , and then flows into the right atrium of the heart.
11. Then the blood goes through the heart and lungs again, and the cycle begins throughout the body.
The circulatory system is a very complex and amazing system. It works 24 hours a day, whether you're awake or asleep. This constant blood flow is what allows you to think, talk, move, and interact with your environment.
What other diseases affect blood circulation in the body?
Various circulatory system diseases can interfere with blood flow throughout the body. For example:
- Weak spots in the arterial walls (Aneurysms) .
- Fatty deposits in the arteries (atherosclerosis) .
- Weakening or damage to the veins (Venous Disease) .
- Abnormal connections between arteries and veins (Arteriovenous Fistulae) .
Sometimes, we can prevent or minimize these conditions from occurring. But sometimes, when factors like heredity (that is, genes you inherit from your parents) and aging play a role, there is little we can do.
However, while not all diseases that affect blood circulation can be prevented, you can talk to a doctor to manage any problems that arise and prevent the condition 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 (low in oil, salt, and sugar, high in fruits and vegetables).
- Exercise for about 150 minutes a week (that's about 30 minutes a day, 5 days a week).
- Limit alcohol consumption .
- Manage stress through things like talk therapy or meditation.
- If you smoke or use other tobacco products, stop .
Close your eyes for a moment and imagine the view out the window as you get ready to disembark from a plane near a big city. A complex network of roads and highways, connecting and disconnecting. Lines of cars keep moving, everyone trying to get to their destination without getting stuck in traffic. That same kind of hustle and bustle is happening inside our bodies all the time, but on a much smaller scale, as blood flows through our heart and veins.
Finally, what to remember (Take-Home Message)
It's easy to forget about these little things that happen inside our bodies because we don't always see 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 all of this works. But knowing a few basics can help you talk to a doctor if you have a health problem, or just talk about ways to stay healthy.
If you have any questions about your blood pressure or any other aspect of your health, never hesitate to ask your doctor. Your health is the most important thing!
` Heartbeat, blood circulation, heart, blood vessels, oxygen, carbon dioxide, heart disease
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