Why do we have two lungs and a single heart?

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Heart which is in the circulatory system’s center is a muscular organ that pumps blood to the body. The circulatory system consists of a network of blood vessels, arteries, veins and capillaries that carry blood to and from all body areas.

The heart is controlled by an electrical system and uses electrical signals to contract its walls. When the heart’s walls are contracted, the blood is pumped into the circulatory system.


1. Overview
2. Blood flow and oxygen
3. How does the heart works
4. Life with two hearts

Blood flow and oxygen

Admission and evacuation valves from the heart chambers are designed to correct blood flow in the right direction. Heart health is vital and it is important for all actions of a person’s body.

Blood carries oxygen and nutrients the bodies need to function in an optimal way. The blood carries carbon dioxide to the lungs so that it can be removed.

A healthy heart supplies the body the amount of blood it needs to function optimally. If a condition or an injury affects the heart, body organs do not receive enough blood to normally perform their functions.

How does the heart works

The human body is pretty amazing. At any time unfolds many biological processes such as digestion, respiration, metabolism and fight invading bacteria. Different parts and systems of the body work together to create a state of balance and a good health.

Have you ever wondered why humans have this structure? Why some organs are paired, while others are unique? Why do we have two lungs and only one heart? It would have been better for a person to have two hearts?

Organs such as lungs, heart, pancreas, brain and liver are vital for any person. These are essential not only for maintaining life but also for each other.

Lungs for example, inspire oxygen and exhale carbon dioxide. Lungs transfer oxygen into the bloodstream and this is transported to the heart to be distributed in the body. Blood carries waste carbon dioxide back to the lungs where is reabsorbed and exhaled.

This is a very old system, the researchers say, and not unique to humans. Organic systems of most animals are composed of a heart and two lungs, except worms and cephalopods – class of invertebrates. Worms have five structures similar to those of the heart and cephalopods three (two to send blood to the gills and one that sends blood to the body) and not the lungs.

System containing a heart and two lungs appeared about 300 million ago when the animals were moved from the sea shore to escape predators and found new sources of food. But why this system has not changed since then?

The simplest explanation given by specialists is that in most animals eventually developed a heart and two lungs, this being needed to survive and progress on Earth.

Life with two hearts

Perhaps you might think that two hearts would be superfluous. Humans have two lungs, two kidneys, two eyes, each of them do the same thing at the same time. Experts believe that sometimes paired organs role is minimized.

Both organs are required for them to function optimal and correct. Otherwise, if the processes will not perform to their maximum capacity, the body will suffer. For example, a person can see with one eye, but the eyes have the function to perceive quite important detail, while one eye won’t provide so much information as both eyes could offer.

If a man needs both lungs to function at full capacity, what would happen if you had an extra heart? The performance would be higher is the processes will be performed if two hearts?

Experts say: NO. The human body is a system built so as to operate at its full capacity. When the system is attacked, hunger, for example, all parts of it suffer the same rate. When a part breaks, the whole system suffers.

If the lungs are affected irreversibly, other functions of the system will slow, as will adapt to the sustained activity that does not work.

The system works as a whole, at full capacity, and an extra heart could mean too much, but the system can also has other potential functions, as if the muscles when they are involved too. We can train our bodies to function at higher levels, as do athletes. As the heart pumps blood to the muscles, a second heart could possibly become stronger over time.

Once the rest of the system will adapt with the second heart, people might become stronger and more resistant, according to researchers. The same would be considered true for the brain. Brain already receives pretty much blood, so it could work at higher levels.

Interestingly, when people are in the embryonic stage of development, actually have two hearts. The primordial heart (describing the development stage of the heart) found in embryonic stage, is represented when two hearts work as a single, with four rooms.

The same is true for the eye, which in the early stages of embryonic development separate to form two eyes. If this division does not occur, there will be only one eye.

Theoretically, it is possible for people to develop two hearts and there might be solutions for them to function at full capacity; this way, people would become a kind of super-powerful beings with a more developed intellect.

People already have evolved a lot and use technology to protect themselves, as such presumably will take action and if they have two hearts, so this to become a boon to human beings.



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