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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,
Inside our chest lies the heart
and our lungs connected with arteries and veins
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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
A very small artery, just big
enough for the red blood cells.
Inside the arteries flows blood
from the heart full of oxygen

Human Heart - - Brain - Skeleton - Blood

pH level of body - Human Health - Biodiversity


Look inside the human body, many organs have to work together
Gastrointestinal tract
The gastrointestinal tract forms an important part of the immune system.
That's were our food goes, where it is digested, so nutrients and energy can be extracted. The rest will leave the body as feces and urine.
Our small intestine starts at the 'duodenum', just behind the stomach, and about 25 cm long.
I we would measure how much space is in the 'mucosa' we would get about 30 m2.
This area has to absorb carbohydrates, proteins, lipids, and vitamins and deliver them into our blood. The midsection of the small intestine is called Jejunum, which is about 2.5 m long. In this part sugars, amino acids, and fatty acids are absorbed and delivered to the bloodstream. The third part of our small intestines is the 'Ileum', which is about 3 m long. Vitamin B12, bile acids, and remaining nutrients are absorbed and delivered to our blood.

Than there are the large intestine, or colon.
The different parts are named cecum, the appendix, rectum, and anal canal.
The appendix is build as a blind-ended tube and connected to the cecum, a pouch-like structure of the colon. There is the junction of the small and the large intestines.
The rectum 'Latin rectum intestinum', is the final straight portion of the large intestine, and about 12 cm long, followed by the anal canal which is about 4 cm long.


Look how big our lungs are, inside the human body are a lot of connections needed to work together. Lungs take the oxygen out of the air and they produce blood
Our lungs - we need them to get our oxygen!

Lets move up to the head:
There our ears are located, but we see only a small part of them, most is inside our head.
Would you have thought that the graphic below shows all the parts of an ear?
Did you know that our ears are the only place in the human body where we have crystals?
Look how many parts belong to the human ear, inside the human body are a lot of connections needed to work together

Here is another view:
Look how many parts belong to the human ear, inside the human body are a lot of connections needed to work together
That is the way we can hear, sometimes we even listen...
All mammals use their ears to hear and to get their balance.
There are three parts:
the outer ear
the middle ear
the inner ear
What we can see is the 'pinna' and the 'ear canal'.
What we cannot see is the inner ear
That why we put the graphic there showing the otolith organs, the utricle and saccule, and the semicircular canals. All part of the vestibular system, as well as the cochlea of the auditory system.

Our ears will not work without a good blood supply
A closeup of a human air growing from inside to outside, see hair root, hair follicle, hair bulb
Hair a growing from inside to outside, sometimes out of the ears.
Some of us have to many hairs, others not enough...

Our hair will not work without a good blood supply:
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 ...

human kidneys inside the body
look at this human kidney

A healthy body 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!
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Mexico environmental problems include not enough affordable nature conservation education to expand food production Spain offers to little conservation education courses - - - Indonesia cuts down a lot of trees. Missing nature conservation education leads to deforestation, water contamination, erosion problems because of deforestation, endangering marine life and humans - - - China has a growing population, more energy, more food, nature conservation education is very low on the to do list - - - German schools offer conservation education, but a lot of people are too busy to learn new things

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