The heart drives blood through the circulatory system, which forms a network of about 100,000 kilometers , that is, two and a half times the circumference of the earth. About one eighth of this blood flow is conducted to the brain, and the rest goes to other parts of the body. In the lower image, the five types of blood vessels are represented.
What is the total length of the blood vessels?
Did you know that eyes are an example of evolution?
According to followers of intelligent design, the eye is an example of irreducible complexity, but the reality is very different.
Morris syndrome: women with testicles
Nature likes diversity, and in humans, sex is far from being the binary variable that many believe it to be.
The most horrendous side of the human being
The social sciences have shown with a series of experiments the most horrendous, primitive and sickly side of human nature.
Discover the life that hides under your nails
Our body has as many microorganisms as cells, and some hide in the most remote places.
They find the oldest heart in history (it is 380 million years old)
The fossil corresponds to an ancient jawed fish. Its structure sheds light on the evolution of the human body.