Our body is a complex system where each organ performs its function. But all the components of the human body function only thanks to one, the most important element - the heart. This muscle is responsible for supplying blood to tissues and organs, without it there is no life, its “breakdown” leads to serious diseases. Knowing how the heart works helps a person coordinate his life activities as efficiently as possible. It will also help to find out and understand why in some situations the limbs of the body turn pale or red. For example, why did the raised hand turn pale and the lowered one turn red? The obvious answer lies in the basic knowledge of the work of the heart and the laws of physics. Having understood the functioning of the heart muscle, a person will understand why this happens and whether it is normal. A brief biological excursion will be useful for both children and adults.
The heart is the pump of the human body
The work of the heart is very similar to the function of a pump that pumps blood and distributes it throughout the body. Blood nourishes vital organs, tissues. She supplies them with oxygen and essential substances. Without this, human life is impossible. The heart consists of four muscle compartments: the right atrium and the corresponding ventricle (right), the left atrium and the corresponding ventricle (left).
Each side of the heart involves pumping blood through specific arteries, veins, and blood vessels. The blood flow throughout the body is usually divided into a small and a large circle. Blood enters the lungs, is enriched with oxygen and continues its path throughout the body. After that, it will again fall into the pulmonary arteries, and the circle will repeat. A continuous flow is ensured thanks to a strong cardiac muscle pumping fluid throughout the entire life cycle of the individual. Knowing the physiology of heart rhythm, one can understand why the raised hand turned pale and the lowered one turned red.
Influence of Newton's Law
Everything on Earth is influenced by gravity. The human circulatory system is no exception. If the body did not have special heart valves, blood would simply accumulate in its lower part due to gravitational attraction. The presence of special jumpers and muscles contributes to an even distribution of blood. This fact and knowledge of the anatomical structure of the heart make it possible to understand why the raised hand turned pale and the lowered one turned red. What are the causes of this phenomenon? Newton's Law.
Why did the raised hand turn pale and the lowered one turn red?
When a person raises a limb up, the blood cannot enter the upper part with the same speed. Its flow slows down due to gravity. If you hold your hand up for a long time, it will not only turn pale, but also numb. A dropped limb, on the contrary, will begin to receive excess blood. For this reason, the veins on the arm can swell, and the skin turns red. The laws of physics and the work of the heart explain this simple phenomenon. There is no panic for concern in this. This is a completely normal state of the limbs in the position of the hands up or down.
Knowing the basic functions of the heart and how the gravitational forces of the Earth act, now everyone can understand why the raised hand turned pale and the lowered one turned red.