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human skeleton model making | easy | simple steps  | diy at home | @howtofunda

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The human heart is pear-shaped and slightly larger than a fist. It is located high in the chest, slightly to the left. The heart of a grown-up person weighs about 8 to 12 ounces (230 to 340 grams).

The heart is made of very strong muscle. This muscle pumps blood by squeezing and relaxing in a regular rhythm. This rhythm is called the heartbeat. The heart muscle beats an average of 70 times per minute. More than 4 quarts (3.8 liters) of blood pass through the heart every minute.

The human heart is divided into right and left halves. Each half is divided into two hollow sections called chambers. The upper chambers are called atria. (Each of these chambers is called an atrium.) The lower chambers are called ventricles.

Blood from the body flows into the right atrium. This blood carries a waste product called carbon dioxide. The blood then passes into the right ventricle. The right ventricle pumps the blood to the lungs. In the lungs, blood picks up oxygen and releases carbon dioxide. The oxygen-rich blood enters the heart's left atrium. The blood then passes into the left ventricle. The left ventricle pumps the blood throughout the body.

Problems with the heart include irregular heartbeat and heart disease. Irregular heartbeat is a heartbeat that is too slow, too fast, or unsteady. Heart disease happens when fatty substances build up inside blood vessels. The fatty deposits block blood from getting to the heart. Heart disease can lead to a heart attack. A heart attack happens when part of the heart muscle dies. Exercise and eating a healthy diet can help to keep the heart healthy.

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The heart is the organ, or body part, that pumps blood through the body. It is the main organ of the cardiovascular system. The cardiovascular system carries substances to...

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The heart is about the size of your fist, and you won't believe the things that this very important organ can do. Prepare to be amazed by these cool heart facts.

So, first let's take a look at how this little bit of dynamite that comes in a small package works.

The heart is like a big pump made of muscles, and it constantly pumps blood throughout our bodies every minute of every day. These movements are called 'involuntary' which means you don't actually have to think about making your heart beat; your brain does the work for you and passes on the message.

So everyone thinks that the heart is on the left side of your chest, well it's not. Whoever made that up has fooled people for years, maybe it was a trickster trying to trick us. It's actually right in the middle of your chest between your two lungs. It is protected by your ribs. At least we know it's in a safe spot!

The heart has four chambers, the left and right atrium and the left and right ventricles. Interestingly 'atrium' is the Latin word for entrance hall and 'ventricle' is the Latin word for little belly. So, there's a little belly inside our hearts...interesting.

There are also four valves in the heart, and these are there to make sure that the blood only goes one way, in or out. Imagine the chaos it would cause if the blood was going in and out all at the same time.

So how does the blood get around our bodies? Well when it leaves the heart it gets taken on a journey through arteries. Have you heard of the aorta and the pulmonary artery? Well these are super important for making sure our blood gets to the right place at the right time. It's like a well-timed train.

But what about when the blood needs to go back to the heart. Well here it is carried through veins. If you look at your wrists, you'll probably be able to see veins which look blue from the outside.

Then there's blood that comes from the lungs into the left atrium; this is transported along nicely through the pulmonary veins, while blood that comes from the body goes flowing in through the superior vena cava (this carries blood from your upper body) and inferior vena cava (this carries blood from your lower body).

You must have felt your own heart beating, well this actually works from electricity, yes really, electricity! Your heart contracts, or tightens up and this makes all the chambers smaller and pushes blood back into the blood vessels. So that's how it's done...interesting! When your heart relaxes again, the chambers get bigger and the blood comes back into your heart. Wow, sounds pretty complex.

Interesting and unusual facts about the heart

The heart weighs between 7 and 15 ounces (about 200 to 425 grams) which is about the same as a bottle of Heinz Ketchup! Pick up a bottle of ketchup and you'll be able to feel how much your heart actually weighs.

Now this is quite unbelievable. The average adult heart beats about 72 times a minute, 100,000 times a day and 3,600 times a year. During a person's life their heart could beat more than 3.5 billion, yes 3.5 billion, times.

This amazing bit of body machinery pumps about 100 gallons (380 liters) of blood through your body, every single hour, which is about 2,400 gallons (9000 liters) per day. Man it works hard. That's about the same as 1,600 glasses of water, per hour and 38,400 glasses of water per day. Wow. We certainly wouldn't be able to drink that much water. Now let's work that out over a lifetime...it pumps about 1 million barrels of blood during an average lifetime which would fill three super tankers. Getting the idea of how hard this little fellow works?

Let's look at it in another way. Turn on your kitchen faucet all the way for 45 years and that is the same amount of blood that is pumped through your heart in a lifetime. Okay, don't turn on the faucet; your parents won't be too pleased at all! What a waste of water too.

Want to know how fast the blood pumps through your aorta? It pumps at 1 mile (1.6km's) per hour. That is pretty fast.

You know when you hear the sound of your heartbeat; it's got a kind of 'lub dub' sound. Well that's from your four heart valves closing. What a cool thing to know.

Your heart does the most physical work out of any other muscle in the body. Hardly surprising when you see all the work it's got to do.

All of your blood vessels, which include arteries, veins and capillaries, are over 60,000 miles long (about 97,000km's). If we had to stretch them all out it would go round the world twice. No way. How they all fit in our body who knows.

This is interesting. During a heartbeat the heart creates pressure, okay cool. Now the amount of pressure it creates would be able to make your blood squirt a distance of about 30 feet (9 meters).

In 1967 Dr Christopher Barnard did the first ever successful heart transplant in Cape Town, South Africa. It was a wonder of medicine.

Can you believe there is actually a time and a day when most heart attacks occur? Well it's between 8 and 9am in the morning and Monday is the most popular day. Perhaps we aren't all that keen on Monday.

To keep your heart healthy you really need to get out there and get some exercise in...at least 30 minutes on most days of the week.

Why is the heart always associated with love? Well there are different theories, the Greeks believed the heart was the seat of the spirit, the Chinese associated it with the center for happiness and the Egyptians thought the emotions and intellect arose from the heart. Then Plato came along and believed that we reason through our brains but love came from our heart.

Early Egyptians believed that the heart, and other organs, moved around inside our bodies. Imagine that, we'd never be able to sit still.

Did you know that the heart can continue to beat outside of the body as long as it has got enough oxygen? Well this is because it has its very own electrical impulse. Freaky.

The heart pumps blood to almost all of the 75 trillion cells in our body. The only part of our body that doesn't get blood is the corneas in our eyes. 75 trillion cells, no way.

This is very interesting and very fast too. When your body is at rest it takes 6 seconds for the blood to go from your heart to your lungs and back again, 8 seconds for it to go to your brain and back and 16 seconds for it to go all the way down to your toes and back.

Imagine this. Your heart creates enough energy every single day to drive a truck for 20 miles (32km's). So if you're 10 you would have been able to drive a truck for 73,000 miles (about 118,000km's). Who knows where you'd be now, but you'd have been able to go to the moon and back.

If you own a cat, you're in luck. It can reduce your risk of having a heart attack by more than a third. Think you should ask your parents for a cat if you don't have one, you'll be super healthy.

Did you know that when you listen to music your heartbeat changes and it takes on the same beat as what you're listening to? So when you're listening to super-fast music your heart beats faster and slower when you're listening to calming music. Amazing huh.

This is grim! In 1929, German surgeon Werner Forssmann examined the inside of his own heart. He threaded a catheter into his arm vein and pushed it 20 inches (50cm's) into his heart. But some good did come out of this as he actually invented something called 'cardiac catheterization' - which doctors now use all the time.

Men and women's hearts beat differently. A women's heartbeat is faster than a man's at 78 beats per minute and a man's at 70 beats per minute.

Do you know what an electrocardiograph is? Well it measures the electric current in the heart and helps doctors to know what's happening in this amazing organ. It was invented in 1903.

If you want to feel how fast your heart is beating put your finger on the side of your wrist or throat. This is your pulse. Get the stopwatch out and see how many times it beats in a minute. As a kid it should beat about 75 to 100 times per minute. Go on, check it out now.

When you're running around, or if you're excited, have you noticed that your heart beats faster? Well that's because your heart needs to work even harder than normal to get more blood to your muscles so they're in tip-top shape. Gosh as if it doesn't work hard enough already.

Now we know the heart works hard, but this might shock you. Even when you're resting your heart is still working at an unbelievable pace...twice as hard as the leg muscles of someone that is sprinting. Amazing.

The aorta is almost as thick as a garden hose. On the flip side, your capillaries are so small that it would take ten of them to be as thick as a piece of hair.

This fist-sized piece of our body is a truly amazing little bit of machinery. Oh the places we can go with it...even to the moon and back!

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The heart is about the size of your fist, and you won't believe the things that this very important organ can do. Prepare to be amazed by these cool heart facts. So, first let's take a look at how this little bit of dynamite that comes in a small package works.

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How the heart actually pumps blood - Edmond Hui

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Trusted information on everyday and complex child health conditions from The Hospital for Sick Children.

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Digestive System | The Dr. Binocs Show | Learn Videos For Kids

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The circulatory is a system of vessels that pass through your entire body. You may read about two types of circulatory systems in animals. There are open circulatory systems in primitive organisms where you will find a heart that pumps fluids through the creature, but no complete system of vessels. More advanced organisms, including you, have closed circulatory systems where the heart is connected to a complete system of vessels. The fluids of a closed circulatory system never leave the vessels.

How does a circulatory system help you? It is the transportation system for your body. The circulatory system carries chemicals to all points in your body. The fluids also carry waste products and dissolved gases for your cells.

Think of the chemical compounds as cars and the circulatory system as a network of freeways, main streets, and side streets. The cars can pass from one building to another using these streets in the same way that a compound might be created in the brain and sent to the kidneys.

The circulatory system touches every organ and system in your body. The system is connected to all of your body's cells so that it can transport oxygen efficiently. When you breathe, the circulatory system carries oxygen to your cells and carries dissolved carbon dioxide back to the lungs.

Every cell that needs oxygen needs access to the fluids in your circulatory system. The circulatory system and its fluids are super important to your digestive system that has absorbed nutrients from your food. Guess what? Hormones created by your endocrine system are sent through the body by the circulatory system.

The core components of your circulatory system are the heart and vessels. You happen to have a four-chambered heart while other organisms may have one, two, or three chambers. The heart is the pump for the system. As blood is pumped from the heart, it passes through a system of arteries, arterioles, and then capillaries. The capillaries are the vessels that allow for most of the transfer of compounds and dissolved gases. Capillaries are very small and have thin walls to allow easier passage of compounds including nutrients, glucose, carbon dioxide, and waste products. After the capillaries, your blood passes through venules and veins. The veins lead the circulatory fluids back to the heart. That's it, the system is complete (and closed).

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The circulatory is a system of vessels that pass through your entire body. You may read about two types of circulatory systems in animals. There are open circulatory systems in primitive organisms where you will find a heart that pumps fluids through the creature, but no complete system of vessels.

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Bones | The Dr. Binocs Show | Learn Videos For Kids

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Respiratory System | The Dr. Binocs Show | Learn Videos For Kids

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Digestive System | The Dr. Binocs Show | Learn Videos For Kids

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The heart is the body's engine room, responsible for pumping life-sustaining blood via a 60,000-mile-long (97,000-kilometer-long) network of vessels. The organ works ceaselessly, beating 100,000 times a day, 40 million times a year-in total clocking up three billion heartbeats over an average lifetime. It keeps the body freshly supplied with oxygen and nutrients, while clearing away harmful waste matter.

The fetal heart evolves through several different stages inside the womb, first resembling a fish's heart, then a frog's, which has two chambers, then a snake's, with three, before finally adopting the four-chambered structure of the human heart.

Function

About the size of its owner's clenched fist, the organ sits in the middle of the chest, behind the breastbone and between the lungs, in a moistened chamber that is protected all round by the rib cage. It's made up of a special kind of muscle (cardiac muscle) that works involuntarily, so we don't have to think about it. The heart speeds up or slow downs automatically in response to nerve signals from the brain that tell it how much the body is being exerted. Normally the heart contracts and relaxes between 70 and 80 times per minute, each heartbeat filling the four chambers inside with a fresh round of blood.

These cavities form two separate pumps on each side of the heart, which are divided by a wall of muscle called the septum. The upper chamber on each side is called the atrium. This is connected via a sealing valve to the larger, more powerful lower chamber, or ventricle. The left ventricle pumps most forcefully, which is why a person's heartbeat is felt more on the left side of the chest.

When the heart contracts, the chambers become smaller, forcing blood first out of the atria into the ventricles, then from each ventricle into a large blood vessel connected to the top of the heart. These vessels are the two main arteries. One of them, the pulmonary artery, takes blood to the lungs to receive oxygen. The other, the aorta, transports freshly oxygenated blood to the rest of the body. The vessels that bring blood to the heart are the veins. The two main veins that connect to the heart are called the vena cava.

Blood Delivery

Since the heart lies at the center of the blood delivery system, it is also central to life. Blood both supplies oxygen from the lungs to the other organs and tissues and removes carbon dioxide to the lungs, where the gas is breathed out. Blood also distributes nourishment from the digestive system and hormones from glands. Likewise our immune system cells travel in the bloodstream, seeking out infection, and blood takes the body's waste products to the kidneys and liver to be sorted out and trashed.

Given the heart's many essential functions, it seems wise to take care of it. Yet heart disease has risen steadily over the last century, especially in industrialized countries, largely due to changes in diet and lifestyle. It has become the leading cause of death for both men and women in the United States, claiming almost 700,000 lives a year, or 29 percent of the annual total. Worldwide, 7.2 million people die from heart disease every year.

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The heart is the body's engine room, responsible for pumping life-sustaining blood via a 60,000-mile-long (97,000-kilometer-long) network of vessels. The organ works ceaselessly, beating 100,000 times a day, 40 million times a year-in total clocking up three billion heartbeats over an average lifetime.

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https://www.ducksters.com/science/blood_and_the_heart.php

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Kids learn about the cardiovascular system including blood, the heart, and blood vessels. The science of the human body's energy delivery system.

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The Human Body: The Heart | Educational Videos For Kids

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THE CIRCULATORY SYSTEM | Educational Video for Kids.

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The Musculoskeletal System | Educational Videos for Kids

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Jan 6, 2016 - Digestive System experiment, digestive system demonstration, digestive system, digestive system model

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Fifth Graders Build a Working Model of the Digestive System

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Mar 12, 2021 - English class fifth graders are learning about the human body and how it works with their teacher, Mr. Gregg. After researching how food is digested, the entire class worked to create a working model of the digestive system. As seen in the collage above, it was certainly a hands-on project and together the fifth grader…

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Human Heart 3D Model | School science project model for  students | The4Pillars

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Aug 11, 2019 - #the4pillarsproject #the4pillars #the4pillarseducationalHuman Heart 3D Model | School science project model for  students | The4PillarsThe heart is a muscula...

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Working Model of Arm and Muscles, Easy Method to make arm muscles

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How to make lungs working MODEL with balloons | DIY respiratory system | science | howtofunda

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BrainPOP animation about Duchenne Muscular Dystrophy

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What causes heart attacks? | #aumsum #kids #science #education #children