Veins are blood vessels containing blood flowing to the heart.
While arteries have blood flowing from the heart.
The blue is representative of blood vessels containing
while the red blood vessels have oxygenated blood fresh from the
lungs. Now, let's follow the path of the blood through the
heart. The superior vena-cava receives blood from
the head, neck, upper limbs and chest.
Meanwhile, the inferior vena-cava receives blood
from the trunk, viscera, and lower limbs.
both superior and inferior vena-cava
end up in the right atrium, one of the four chambers of the heart.
The heart not only has four chambers, it also has four
valves. The purpose of the valves is to keep
blood moving in the right direction and not flow backwards.
Blood exits the right atrium through the tricuspid valve
so called because it has three flaps, and
enters the right ventricle. the blood exits the
right ventricle through the pulmonary valve and enters the
pulmonary artery. Again, it is an artery because
blood is flowing away from the heart, but it is blue because
it lacks oxygen.
The pulmonary artery then splits into the left and right
pulmonary arteries, which go to each respective lung.
In the lungs, gas exchange occurs.
The blood discards carbon dioxide and picks up oxygen.
Now, blood comes back from the lungs through the pulmonary veins,
entering the left atrium. Next, the blood is pumped into the left
into the left ventricle through the mitral, or bicuspid valve.
finally, the oxygenated blood leaves the left ventricle
through the aortic semi-lunar valve, entering the
the aorta, which is the largest of all the arteries, distributes the
oxygenated blood to the rest of the body. The aortic
arch has three major branches, which supply
the head and arms with blood. Then, the aorta
curls downward from behind the heart, forming the descending aorta,
which descends through the chest and continues down through the abdomen.
In the abdomen, the descending aorta splits to supply the pelvis
and legs with blood.
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