How Many Chambers Does a Birds Heart Have? – Bird Circulatory System


Written by

Clinton Atkins



George Dukes

How Many Chambers Does a Birds Heart Have

How many chambers does a bird’s heart have? Well, this should surprise you that, like humans, a bird’s heart also has 4 chambers. In fact, that is among the biological similarities between mammals and birds, too.

Four bird heart chambers include two ventricles and two atria, actually give birds an advantage in the wild and the course of evolution. To dive into the skies, swim through the waters, or even run through the fields, it’s their hearts that give them such high energy and efficient oxygen supply.

Bird Anatomy and Cardiovascular System


A bird’s cardiovascular system is responsible for enabling the transporting of blood throughout the bird’s body. This way, the blood can deliver what needs to be given to the bird’s cells.

Their cardiac anatomy’s key parts include the heart and its blood vessels. The role of these two is to:

  • bring nutrients, oxygen, and hormones to the cells that need it
  • deal with the waste and carbon dioxide lingering in the body
  • This system is also responsible for controlling the body’s temperature

The cardiovascular system is an essential part of life. If a bird were to have a dysfunctional cardiovascular system, their body would shut down and die since the cells wouldn’t receive the oxygen or nutrients it needs to survive.

Now, where is a bird’s heart located? You’ll find it in the bird’s thoracoabdominal cavity right within the cranial section. Inside, it’ll be right in between the liver’s lobes.

Bird Circulatory System


Though the circulatory and cardiovascular systems handle blood, their roles and parts can be quite different.

  • The biggest difference between the two would be that the circulatory system is responsible for pumping blood with its heart and blood vessels.
  • Meanwhile, the circulatory system is the main route that comprises the entire body.

The circulatory system of a bird is an excellent addition. The four heart chambers prevent blood with oxygen and those without from getting mixed.

Since they’re separated, the body will receive blood with a high oxygen count.

After passing through the heart, the blood makes it to the closed, main circulatory system. A closed circulatory system makes it so that the bird’s body can have more agility and movement.

With the closed system, the blood pumped through will be completely separated from the body’s interstitial fluid.

Chamber Structure of a Bird’s Heart


Birds, along with other mammals, have hearts with four chambers. This special evolution makes it so their lungs have two separate low and high-pressure flows going to the lungs and all over the body.

Since a bird’s blood is warm, they need more oxygen to make up for the work they do throughout the day. Having this specialized heart gives them the strength to live in chilly conditions.

The bird heart anatomy uses these four chambers to separate blood with and without oxygen. A bird’s 4 chambered heart consists of the following:

The atria are meant to store the blood.

  • The left atrium sends oxygen-filled blood to the left ventricle.
  • The right atrium has a similar job in the bird heart diagram.
  • Meanwhile, the purpose of the right ventricle is to push the blood into our lungs.
  • And, the left ventricle is the one that handles everything else, as it pumps bloods to the bird’s body. Therefore, in the heart of a bird, the left ventricle’s job is on a larger scale; it needs more pressure to pump blood to its needed areas.

Because of the pressure, the left ventricle is stronger in strength and build due to its thick, muscled walls.

When it comes to the heart rate of birds it differs between different breeds or animals. For a regular chicken, it would only be around two hundred beats every minute. Meanwhile, a hummingbird’s heart can last for over a thousand.

Avian vs. Mammalian Heart Chambers

Let’s go over the bird heart vs. human heart. The bird’s heart may have 4 parts like a human’s, but the difference lies in its smooth, simple walls.

The right atrium and ventricle have a singular flapped myocardium; the left is tricuspid instead of bi. In addition, the larger, muscular avian heart structure has a connection with a system of conductive fibers.


So, how many chambers does a bird’s heart have? The answer is four, A sturdy and efficient heart system that evolved over millennia to ensure the avian species’ survival in the ever-changing world we live in.

Its specialized structure makes it so birds can migrate to different continents, swim against currents, and even withstand the arctic cold.

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