6 animals that possess the heart

Squid has three hearts, cockroach heart beating with people, resurrection zebra fish heart . and other interesting things you can only see in the animal world.

Did you know, our hearts beat 72 beats per minute while at the same time, a hibernating heart beats only 5 times but for hummingbirds is 1,260 times.

The human heart weighs only about 0.3kg but this figure in giraffes is 12kg - the reason is because they need a very strong heart to pump blood through the long neck. But the animal world also contains more interesting things than that.

The hearts of the animals below will surprise you:

1. Molluscs have up to three hearts

All aquatic species including octopus, squid or starfish actually have three hearts. In particular, two side-hearted hearts help molluscs absorb blood and central heart plays a role in regulating blood through arteries to feed the body.

Imagine if people have three hearts, how many years will they live?

In particular, the blood provided by the three hearts above is not red as we imagine. In fact, the blood of these soft body types is green because the cells contain many copper elements. The reason is that human and mammal blood are red because they contain a lot of iron in hemoglobin.

2. Cockroaches: the heart does not do the task

Like other insects, cockroaches have a special circulatory system when blood does not always fill in all the circuits, but only revolves around 12 to 13 main roads.

The spinal sinuses, which are located on the top of the stem of the cockroach, help transfer oxygen-absorbed blood to the chambers of the heart. However, the heart here does not serve to circulate blood throughout the body like the heart in other animals.

This is because cockroaches and other insects breathe through the air holes in the body instead of the lungs, so blood is also not required to carry oxygen from one place to another. In addition, according to Don Moore III expert at Smithsonian National Zoo, cockroach heart beats with human heart.

3. "fake" earthworms

Earthworms are animals without hearts, but they have up to five parts called "fake hearts" surrounding the esophagus. These fake hearts are not supposed to pump blood, but only carry out the contraction of blood vessels to help blood circulation take place. In addition, worms do not have lungs and they absorb oxygen through their moist skin.

Earthworms have red blood because they contain hemoglobin, the protein that carries oxygen. However, unlike humans, they have an open circulatory system, so hemoglobin only driftes between the remaining substances rather than being absorbed or metabolized.

4. Zebra fish can regenerate the heart

If a zebrafish has a heart attack, they will immediately recreate a new fruit instead. In a study published in the journal Science in 2002, researchers pointed out that zebrafish can regenerate 20% of the damaged heart muscle in just two months.

The heart of zebrafish fish sometimes gets hurt

If the human liver can replicate itself, reptiles or amphibians can regrow their own tail, the zebrafish's ability to regenerate the heart is at the forefront of the study of cardiovascular development. However, the heart of this fish is extremely special because they have only one atrium and one ventricle and has two completely different structures than the human heart.

For other animals, the heart is responsible for transporting oxygen throughout the body. However, with fish, the vertebral sinuses transport the oxygen back and forth between the ventricles and the atria. The thinner the ventricle, the thicker the artery wall and the faster the blood is pumped to the atria.

5. Whales have huge giant hearts

According to James Mead, honorary chairman of the Smithsonian Academy, the whale heart has four chambers and is known for being the largest in the animal world. This must be an extremely large and extremely healthy heart to have more oxygen pumped around the massive body like two buses of this species. It is estimated that blue whale heart weighs 589kg, equivalent to the weight of nearly 9 adults (average weight of 70kg).

Besides, scientists also found that the wall consists of the main arteries in the heart of the whale with the thickness equivalent to the length of an iPhone 6 Plus.

6. Frog heart has only three compartments

According to researcher Daniel Mulcachy of the Washington Research Institute, the hearts of most mammals and birds have four chambers but with frogs there are only three compartments, including two atria and one ventricle.

This heart is responsible for filtering oxygen that the body absorbs, moving it through the lungs to breathe and then pushing oxygen to all organs.

For the human heart, the oxidation of blood cells and the separation of oxygen from these cells are two completely separate processes but for frogs, a part called cardiac muscle keeps these two processes working independently. each other in the same ventricle.

According to Mulcachy, frogs not only get oxygen through their lungs but also from their skin. The frog's heart also actually works on its own principle - the blood cells enter the right atrium and come out of the ventricles to the lungs and skin to get oxygen. Cells that have absorbed oxygen then return to the left atrium, to the ventricles and bring oxygen to the body's organs.