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The heart is one most important organ of a mammals. We need our heart to work constantly, or we have a heart problem. Pulmonary circulation is the movement of blood from the heart, to the lungs, and back to the heart again. This is just one phase of the overall circulatory system. The veins bring waste-rich blood back to the heart, entering the right atrium throughout two large veins called vena cavae. The right atrium fills with the waste-rich blood and then contracts, pushing the blood through a one-way valve into the right ventricle. The right ventricle fills and then contracts, pushing the blood into the pulmonary artery which leads to the lungs. In the lung capillaries, the exchange of carbon dioxide and oxygen takes place. The fresh, oxygen-rich blood enters the pulmonary veins and then returns to the heart, re-entering through the left atrium. The oxygen-rich blood then passes through a one-way valve into the left ventricle where it will exit the heart through the main artery, called the aorta. The left ventricle's contraction forces the blood into the aorta and the blood begins its journey throughout the body. The one-way valves are important for preventing any backward flow of blood. The circulatory system is a network of one-way streets. If blood started flowing the wrong way, the blood gases (oxygen and carbon dioxide) might mix, causing a serious threat to your body. You can use a stethoscope to hear pulmonary circulation. The two sounds you hear, 'lub' and dub, are the ventricles contracting and the valves closing
Inside our chest lies the heart
our lungs connected with arteries / veins

Human Heart

an important big muscle

On this web page
we just try to give
you a little glimpse.
Send us an email to learn more!
Conservation Nature education online Biology: the human heart is an important part of human body. The heart, like other body parts, needs oxygen in order to grow and develop properly. During childhood, the body's years of rapid growth, the need for oxygen is greatest. The heart's rate of pumping oxygen-rich blood is fastest in infancy, about 120 beats per minute. As the child grows, the heart rate slows. A seven year old child's heart beats about 90 times per minute. By the age of 18, the heart rate has stabilized to about 70 beats per minute.By adulthood, the heart is fully developed. Throughout life, the heart needs only to be maintained and kept healthy in order to function. While the circulatory system is busy providing oxygen and nourishment to every cell of the body, let's not forget that the heart, which works hardest of all, needs nourishment, too. Coronary circulation refers to the movement of blood through the tissues of the heart. The circulation of blood through the heart is just one part of the overall circulatory system
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3000 years ago, a Chinese doctor wrote down: ".. the heart regulates all blood in the human body
The blood never stops circulating ..."
This knowledge was forgotten for 1500 years.
The English doctor William Harvey published 1628 "How the heart and the blood moves"
An accident happens, you got a cut - a red sap drops out:
Blood - a fluid that is pumped by your heart through the vessels of your body!
blood circles through the body of every mammal. The circulatory system is an organ system that passes nutrients, amino acids, electrolytes and lymph, gases, hormones, blood cells, etc. to and from cells in the body to help fight diseases, stabilize body temperature and pH, and to maintain homeostasis. The medium of transport for the nutrients, etc are the blood cells. This system may be seen strictly as a blood distribution network, but some consider the circulatory system as composed of the cardiovascular system, which distributes blood, and the lymphatic system, which distributes lymph. Humans have a closed cardiovascular system, our blood normally doesn't leaves our body, always runs in our arteries, veins and capillaries. The lymphatic system, also driven by our heart is an open system. Blood and lymph run through our circulatory system. The blood, heart, and blood vessels form the cardiovascular system. The lymph, lymph nodes, and lymph vessels form the lymphatic system. When we talk about the circulatory system we talk about two systems: The cardiovascular system and the lymphatic system
The heart pumps blood through all of our arteries and veins
Human heart cycle, the heart cycle keeps humans alive
Blood circles through our body, through the bodies of all mammals.

Environmental education online by Bear Springs blossom Nature conservation: blood vessels in the human body. Veins are similar to arteries but, because they transport blood at a lower pressure, they are not as strong as arteries. Like arteries, veins have three layers: an outer layer of tissue, muscle in the middle, and a smooth inner layer of epithelial cells. However, the layers are thinner, containing less tissue. Veins receive blood from the capillaries after the exchange of oxygen and carbon dioxide has taken place. Therefore, the veins transport waste-rich blood back to the lungs and heart. It is important that the waste-rich blood keeps moving in the proper direction and not be allowed to flow backward. This is accomplished by valves that are located inside the veins. The valves are like gates that only allow traffic to move in one direction. The vein valves are necessary to keep blood flowing toward the heart, but they are also necessary to allow blood to flow against the force of gravity. For example, blood that is returning to the heart from the foot has to be able to flow up the leg. Generally, the force of gravity would discourage that from happening. The vein valves, however, provide footholds for the blood as it climbs its way up. Blood that flows up to the brain faces the same problem. If the blood is having a hard time climbing up, you will feel light-headed and possibly even faint. Fainting is your brain's natural request for more oxygen-rich blood. When you faint, your head comes down to the same level as your heart, making it easy for the blood to quickly reach the brain.Because it lacks oxygen, the waste-rich blood that flows through the veins has a deep red color, almost like maroon. Because the walls of the veins are rather thin, the waste-rich blood is visible through the skin on some parts of the body. Look at your wrist, or hands, or ankles. You can probably see your veins carrying your blood back to your heart. Your skin refracts light, though, so that deep red color actually appears a little blue from outside the skin
With this circulatory system our body gets its nutrients,
gets hormones, liquids. Repair cells are transported to damages,
? oxygen filled red blood cells bring energy to muscles,
and a big part to our brain!


In red you see the arteries transporting oxygen,
in blue you see veins, blood with low amounts of oxygen.
moving back towards the heart, than into the lungs.

Look at all the arteries and veins!
Imagine 60000 miles of bigger and smaller pipes
in every human body!
That is about 2 times around our globe ...
our muscle engine heart has to work 24/7
every day of the year
every day as long as we live!
science biology education: human heart, a wonderful machine, working from the beginning in mothers womb, to the end when we die. The circulatory system is a network of flexible tubes through which blood flows as it carries oxygen and nutrients to all parts of the body. It includes the heart, lungs, arteries, arterioles (small arteries) and capillaries (minute blood vessels). It also includes venules (small veins) and veins, the blood vessels through which blood flows as it returns to the heart. If all these vessels were laid end-to-end, they would extend for about 60,000 miles--far enough to encircle the earth more than twice.
If we would drain all the blood out of an adult human body
about 5 liters = 5.3 US-quarts of blood would be in our bucket
video graphic how the human heart pumps. video clip - work with us to secure Nature, to keep humans on earth alive
click to see video clip how a human heart moves blood

Pulmonary circulation is the movement of blood from the heart, to the lungs, and back to the heart again. This is just one phase of the overall circulatory system. The veins bring waste-rich blood back to the heart, entering the right atrium throughout two large veins called vena cavae. The right atrium fills with the waste-rich blood and then contracts, pushing the blood through a one-way valve into the right ventricle. The right ventricle fills and then contracts, pushing the blood into the pulmonary artery which leads to the lungs. In the lung capillaries, the exchange of carbon dioxide and oxygen takes place. The fresh, oxygen-rich blood enters the pulmonary veins and then returns to the heart, re-entering through the left atrium. The oxygen-rich blood then passes through a one-way valve into the left ventricle where it will exit the heart through the main artery, called the aorta. The left ventricle's contraction forces the blood into the aorta and the blood begins its journey throughout the body. The one-way valves are important for preventing any backward flow of blood. The circulatory system is a network of one-way streets. If blood started flowing the wrong way, the blood gases (oxygen and carbon dioxide) might mix, causing a serious threat to your body. You can use a stethoscope to hear pulmonary circulation. The two sounds you hear, lub and dub, are the ventricles contracting and the valves closing
The most important connection:
The heart pumps blood to the lungs
to enrich it with oxygen,
and to get rid of the carbon dioxide CO2

Biology education online: human body education: the human heart has two circles. one pumps the blood through our body, the other pumps blood into our lungs to acquire new oxygen, releasing carbon dioxide
That's the way blood ingredients are pumped through our blood vessels
Our heart transports blood enriched with oxygen and other ingredients
Blood brings nutrients to every cell in our body.
Blood takes the oxygen while been pumped through our lungs.

Conservation education Human environment: heart is the engine pumping blood through all our body. Blood is transported by the heart in all mammals. The heart you see drawn on the average Valentine is only a rough representation of the actual structure of the heart. Your heart is actually shaped more like an upside-down pear. The human heart is primarily a shell. There are four cavities, or open spaces, inside the heart that fill with blood. Two of these cavities are called atria. The other two are called ventricles. The two atria form the curved top of the heart. The ventricles meet at the bottom of the heart to form a pointed base which points toward the left side of your chest. The left ventricle contracts most forcefully, so you can best feel your heart pumping on the left side of your chest. The left side of the heart houses one atrium and one ventricle. The right side of the heart houses the others. A wall, called the septum, separates the right and left sides of the heart. A valve connects each atrium to the ventricle below it. The mitral valve connects the left atrium with the left ventricle. The tricuspid valve connects the right atrium with the right ventricle. The top of the heart connects to a few large blood vessels. The largest of these is the aorta, or main artery, which carries nutrient-rich blood away from the heart. Another important vessel is the pulmonary artery which connects the heart with the lungs as part of the pulmonary circulation system. The two largest veins that carry blood into the heart are the superior vena cava and the inferior vena cava. They are called -vena cava- because they are the heart's veins. The superior is located near the top of the heart. The inferior is located beneath the superior. The heart's structure makes it an efficient, never-ceasing pump. From the moment of development through the moment of death, the heart pumps. The heart, therefore, has to be strong. The average heart's muscle, called cardiac muscle, contracts and relaxes about 70 to 80 times per minute without you ever having to think about it. As the cardiac muscle contracts it pushes blood through the chambers and into the vessels. Nerves connected to the heart regulate the speed with which the muscle contracts. When you run, your heart pumps more quickly. When you sleep, your heart pumps more slowly. Considering how much work it has to do, the heart is surprisingly small. The average adult heart is about the size of a clenched fist and weighs about 11 ounces 310 grams. Located in the middle of the chest behind the breastbone, between the lungs, the heart rests in a moistened chamber called the pericardial cavity which is surrounded by the ribcage. The diaphragm, a tough layer of muscle, lies below. As a result, the heart is well protected. To monitor the heart, scientists can use x-ray or scanning technology to get a picture. To really explore the heart, scientists have to perform surgery. Heart surgery is very risky because the heart's pumping action is so critical for survival. If the heart stops pumping, the body cannot survive. Before beginning heart surgery, doctors connect the patient to a machine that pumps the blood for the heart. Only then is it safe for the doctor to stop the heart in order to operate
Our heart - a strong muscle around a shell, pumping blood, quart by quart, as long as we live ...
Our heart has four cavities that fill with blood.
Doctors call these two cavities atria, the
other two cavities are named ventricles.
The two atria form the curved top of the heart.
The left ventricle contracts most forcefully!
Between the two halves is a wall, called the septum,
separating the right and left sides of the heart.
For a connection the mitral valve and the
aortic valve, normally a tricuspid, what means
with three leaflets, valve opens and closes.
On the top of our heart large blood vessels start the transport.
The largest is the aorta, also called main artery,
which carries nutrient-rich blood away from the heart.
The other very important vessel is the pulmonary artery
which connects the heart with the lungs
as part of the pulmonary circulation system.

Conservation education Human health: Science graphic of a human arteries. Tubular Circulation. In a general sense, a vessel is defined as a hollow utensil for carrying something: a cup, a bucket, a tube. Blood vessels, then, are hollow utensils for carrying blood. Located throughout your body, your blood vessels are hollow tubes that circulate your blood. There are three varieties of blood vessels: arteries, veins, and capillaries. During blood circulation, the arteries carry blood away from the heart. The capillaries connect the arteries to veins. Finally, the veins carry the blood back to the heart. If you took all of the blood vessels out of an average child, and laid them out in one line, the line would be over 60,000 miles long! An adult's vessels would be closer to 100,000 miles long! Besides circulating blood, the blood vessels provide two important means of measuring vital health statistics: pulse and blood pressure. We measure heart rate, or pulse, by touching an artery. The rhythmic contraction of the artery keeps pace with the beat of the heart. Since an artery is near the surface of the skin, while the heart is deeply protected, we can easily touch the artery and get an accurate measure of the heart's pulse. When we measure blood pressure, we use the blood flowing through the arteries because it has a higher pressure than the blood in the veins. Your blood pressure is measured using two numbers. The first number, which is higher, is taken when the heart beats during the systole phase. The second number is taken when the heart relaxes during the diastole phase. Those two numbers stand for millimeters. A column of mercury rises and falls with the beat of the heart. The height of the column is measured in millimeters. Normal blood pressure ranges from 110 to 150 millimeters (as the heart beats) over 60 to 80 millimeters (as the heart relaxes). It is normal for your blood pressure to increase when you are exercising and to decrease when you are sleeping. If your blood pressure stays too high or too low, however, you may be at risk of heart disease. The English word veins comes from the Latin word vena
Here you see a very small artery, just big
enough for the red blood cells.
Inside the arteries blood is transported
away from the heart full of oxygen
enriched later with nutrients, hormones

A healthy heart is very important for our life!

What can we do to keep our bodies healthy?
Eat in balance, drink in balance, don't smoke,
don't use illegal drugs!
Train your brain as you train your body!
Enjoy life - enjoy Nature!
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