Heart organ with label

Learn more. Coronary arteries supply blood to the heart muscle. Like all other tissues in the body, the heart muscle needs oxygen-rich blood to function. Also, oxygen-depleted blood must be carried away. The coronary arteries wrap around the outside of the heart.

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Content:

• Interactive Tools
• Your Heart & Circulatory System
• How The Heart Works
• 21.3. Mammalian Heart and Blood Vessels
• Anatomy and Function of the Coronary Arteries
• Understanding how your heart functions
• At the Heart of It All: Anatomy and Function of the Heart

WATCH RELATED VIDEO: How to draw human heart

Interactive Tools

We see and hear about hearts everywhere. A long time ago, people even thought that their emotions came from their hearts, maybe because the heart beats faster when a person is scared or excited. Now we know that emotions come from the brain , and in this case, the brain tells the heart to speed up. So what's the heart up to, then? How does it keep busy? What does it look like?

Let's find out. Your heart is really a muscle. It's located a little to the left of the middle of your chest, and it's about the size of your fist.

There are lots of muscles all over your body — in your arms, in your legs, in your back, even in your behind. But the heart muscle is special because of what it does. The heart sends blood around your body. The blood provides your body with the oxygen and nutrients it needs.

It also carries away waste. Your heart is sort of like a pump, or two pumps in one. The right side of your heart receives blood from the body and pumps it to the lungs. The left side of the heart does the exact opposite: It receives blood from the lungs and pumps it out to the body. How does the heart beat? Before each beat, your heart fills with blood.

Then its muscle contracts to squirt the blood along. When the heart contracts, it squeezes — try squeezing your hand into a fist. That's sort of like what your heart does so it can squirt out the blood. Your heart does this all day and all night, all the time. The heart is one hard worker! The heart is made up of four different blood-filled areas, and each of these areas is called a chamber.

There are two chambers on each side of the heart. One chamber is on the top and one chamber is on the bottom. The two chambers on top are called the atria say: AY-tree-uh. If you're talking only about one, call it an atrium. The atria are the chambers that fill with the blood returning to the heart from the body and lungs.

The heart has a left atrium and a right atrium. The two chambers on the bottom are called the ventricles say: VEN-trih-kulz. The heart has a left ventricle and a right ventricle. Their job is to squirt out the blood to the body and lungs. Running down the middle of the heart is a thick wall of muscle called the septum say: SEP-tum. The septum's job is to separate the left side and the right side of the heart. The atria and ventricles work as a team — the atria fill with blood, then dump it into the ventricles.

The ventricles then squeeze, pumping blood out of the heart. While the ventricles are squeezing, the atria refill and get ready for the next contraction. So when the blood gets pumped, how does it know which way to go? Well, your blood relies on four special valves inside the heart. A valve lets something in and keeps it there by closing — think of walking through a door. The door shuts behind you and keeps you from going backward. They let blood flow from the atria to the ventricles.

The other two are called the aortic say: ay-OR-tik valve and pulmonary say: PUL-muh-ner-ee valve , and they're in charge of controlling the flow as the blood leaves the heart. These valves all work to keep the blood flowing forward. They open up to let the blood move ahead, then they close quickly to keep the blood from flowing backward. You probably guessed that the blood just doesn't slosh around your body once it leaves the heart.

It moves through many tubes called arteries and veins , which together are called blood vessels. These blood vessels are attached to the heart. The blood vessels that carry blood away from the heart are called arteries. The ones that carry blood back to the heart are called veins. The movement of the blood through the heart and around the body is called circulation say: sur-kyoo-LAY-shun , and your heart is really good at it — it takes less than 60 seconds to pump blood to every cell in your body.

Your body needs this steady supply of blood to keep it working right. Blood delivers oxygen to all the body's cells. To stay alive, a person needs healthy, living cells. Without oxygen, these cells would die. If that oxygen-rich blood doesn't circulate as it should, a person could die. The left side of your heart sends that oxygen-rich blood out to the body. The body takes the oxygen out of the blood and uses it in your body's cells.

When the cells use the oxygen, they make carbon dioxide and other stuff that gets carried away by the blood. It's like the blood delivers lunch to the cells and then has to pick up the trash! The returning blood enters the right side of the heart. The right ventricle pumps the blood to the lungs for a little freshening up.

In the lungs, carbon dioxide is removed from the blood and sent out of the body when we exhale. What's next? An inhale, of course, and a fresh breath of oxygen that can enter the blood to start the process again. And remember, it all happens in about a minute! When you go for a checkup, your doctor uses a stethoscope to listen carefully to your heart. A healthy heart makes a lub-dub sound with each beat.

This sound comes from the valves shutting on the blood inside the heart. The first sound the lub happens when the mitral and tricuspid valves close. The next sound the dub happens when the aortic and pulmonary valves close after the blood has been squeezed out of the heart.

Next time you go to the doctor, ask if you can listen to the lub-dub, too. Even though your heart is inside you, there is a cool way to know it's working from the outside. It's your pulse. You can find your pulse by lightly pressing on the skin anywhere there's a large artery running just beneath your skin. Two good places to find it are on the side of your neck and the inside of your wrist, just below the thumb.

You'll know that you've found your pulse when you can feel a small beat under your skin. Each beat is caused by the contraction squeezing of your heart. If you want to find out what your heart rate is, use a watch with a second hand and count how many beats you feel in 1 minute.

When you are resting, you will probably feel between 70 and beats per minute. When you run around a lot, your body needs a lot more oxygen-filled blood. Your heart pumps faster to supply the oxygen-filled blood that your body needs. You may even feel your heart pounding in your chest. Try running in place or jumping rope for a few minutes and taking your pulse again — now how many beats do you count in 1 minute?

Most kids are born with a healthy heart and it's important to keep yours in good shape. Here are some things that you can do to help keep your heart happy:. Your heart deserves to be loved for all the work it does. It started pumping blood before you were born and will continue pumping throughout your whole life.

Reviewed by: Steven Dowshen, MD. Larger text size Large text size Regular text size. The Heart Is a Muscle. How the Heart Beats How does the heart beat? Page 1 Parts of the Heart The heart is made up of four different blood-filled areas, and each of these areas is called a chamber. Page 2 How Blood Circulates You probably guessed that the blood just doesn't slosh around your body once it leaves the heart.

Page 3 Listen to the Lub-Dub When you go for a checkup, your doctor uses a stethoscope to listen carefully to your heart. Pretty Cool — It's My Pulse! Keep Your Heart Happy Most kids are born with a healthy heart and it's important to keep yours in good shape.

Your Heart & Circulatory System

The human heart pumps blood to every part of your body. Learn about the different parts of the heart and watch our video about how a healthy heart works. Your heart is the pump which powers your body. It supplies blood carrying oxygen and nutrients to every cell, nerve, muscle and vital organ in your body. It sits in your chest between your lungs, slightly to the left of centre, and is protected by your rib cage. Your heart is about the size of your clenched fist and weighs about grams that's just over half a packet of butter.

How The Heart Works

The heart has 4 chambers, 2 upper chambers atria and 2 lower chambers ventricles. Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood. Valves are actually flaps leaflets that act as one-way inlets for blood coming into a ventricle and one-way outlets for blood leaving a ventricle. Normal valves have 3 flaps leaflets , except the mitral valve. It only has 2 flaps. The 4 heart valves are:. Tricuspid valve. This valve is located between the right atrium and the right ventricle.

21.3. Mammalian Heart and Blood Vessels

The heart is a muscular organ that pumps blood through the blood vessels of the circulatory system. Blood transports oxygen and nutrients to the body. It is also involved in the removal of metabolic wastes. In this activity, students use online and paper resources to identify and label the main parts of the heart.

Anatomy and Function of the Coronary Arteries

The heart is a muscular organ that acts like a pump to send blood throughout the body all the time. It has four chambers — two on the left side and two on the right. The two upper chambers are called the atria , and the two lower chambers are called the ventricles. The two sides of the heart are divided by a muscular wall called the septum. The heart is at the centre of the circulatory system, which delivers blood to all areas of the body.

Understanding how your heart functions

The blood that flows through the fetus is actually more complicated than after the baby is born normal heart. The placenta accepts the blood without oxygen from the fetus through blood vessels that leave the fetus through the umbilical cord umbilical arteries, there are two of them. When blood goes through the placenta it picks up oxygen. The oxygen rich blood then returns to the fetus via the third vessel in the umbilical cord umbilical vein. The oxygen rich blood that enters the fetus passes through the fetal liver and enters the right side of the heart. The oxygen rich blood goes through one of the two extra connections in the fetal heart that will close after the baby is born. The hole between the top two heart chambers right and left atrium is called a patent foramen ovale PFO. This hole allows the oxygen rich blood to go from the right atrium to left atrium and then to the left ventricle and out the aorta.

At the Heart of It All: Anatomy and Function of the Heart

In this interactive, you can label parts of the human heart. Drag and drop the text labels onto the boxes next to the diagram. Selecting or hovering over a box will highlight each area in the diagram. Drag and drop the text labels onto the boxes next to the heart diagram.

The primary function of the heart and blood vessels is to transport oxygen, nutrients, and byproducts of metabolism. Oxygenated and nutrient rich blood is distributed to tissues via the arterial system, which branches into smaller and smaller blood vessels from arteries to arterioles to capillaries where most exchange occurs. Deoxygenated blood and metabolic byproducts are returned from capillaries via venules and then vein. The heart functions as a pump to maintain circulation. The heart is a discrete organ, which in humans has four distinct chambers.

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Your heart is roughly the size of a fist and sits in the middle of your chest, slightly to the left. This blood sends oxygen and nutrients to all parts of your body, and carries away unwanted carbon dioxide and waste products. The two small upper chambers are the atria.