List of animals with the strangest hearts in the world

The animal world contains many interesting things and information about the animals with the strangest hearts in the world is one of them. Due to the different body sizes and structural characteristics, the hearts of each animal will form a unique shape and characteristics.

Octopus and squid

Squid and octopus are rare animals that possess up to three hearts in one body. To maintain respiration, squid and octopus use two hearts on either side of their body to pump oxygen through the blood vessels. Meanwhile, the central heart transports oxygen to the remaining organs.

Octopuses have a relatively short lifespan, with some species living only six months. Reproduction issues are thought to be one of the main reasons for the short lifespan of this animal.

List of animals with the strangest hearts in the world - 1 — Octopuses and squid have up to three hearts.

Frogs

In most animals, the heart is responsible for taking blood from the body to the lungs to pick up oxygen and supply it to other organs. Or like in humans, oxygenated blood and deoxygenated blood are stored in separate compartments. But in frogs, oxygen is not only taken from the lungs but also from the skin. Oxygenated blood is separated from deoxygenated blood in the same compartment.

Even more bizarre is that frogs' hearts can freeze. The heart of a wood frog stops beating completely when the frog freezes during hibernation.

Cockroaches

Of the 4,600 species of cockroaches, about 30 live in close proximity to humans. About four species are known to be pests. Wingless cockroaches have hearts that are smaller than those of flying cockroaches, and their hearts beat at a similar rate to a human heart.

Cockroaches have an open circulatory system, meaning their blood does not fill up with blood vessels. Their hearts also do not beat on their own. Muscles in their cavities expand and contract to help the heart send hemolymph to the rest of the body.

Whale

The blue whale's heart is the largest of any living animal, about the size of a small car and weighing about 430 pounds. Like other mammals, the whale's heart has four chambers. When they dive deep into the ocean, their heart rate slows to just four beats per minute.

The blue whale dwarfs some extinct creatures like the dinosaurs in size. One of the largest dinosaurs of the Mesozoic Era was Argentinosaurus, which weighed up to 90 tons but was only about the size of an average blue whale.

List of animals with the strangest hearts in the world - 2 — The whale heart weighs a lot.

Earthworms

Earthworms are animals that do not have a heart. Instead, they have five pseudopods that surround their esophagus, which help promote blood circulation and nourish their bodies.

They also lack lungs and absorb oxygen through their moist skin. In addition, earthworms have the ability to regenerate lost segments. However, this ability depends on the individual species.

Zebrafish

Zebrafish are also animals with unique hearts. In addition to an atrium and a ventricle, they have two structures never seen in humans: the sinus venosus (a sac located in front of the atrium) and the ductus arteriosus (a tube located just behind the ventricle).

Because the gills are fragile and can be damaged if the blood pressure gets too high, the zebrafish heart is specially designed. In addition, the zebrafish heart can regenerate. When they have heart damage, the body will regenerate a new one to replace it.

Tuyet Anh (Source: Synthesis)

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