How many hearts does an octopus have?

Octopuses have a distinctive appearance with a large head and eight tentacles. The tentacles are large, strong, wriggling, densely packed with terrifying suction cups, easily grabbing prey. Known as “sea monsters”, most other animals do not dare to go near octopuses.

Octopus is an animal with many hearts.

How many hearts does an octopus have?

The octopus is one of the few animals that does not have just one heart like the vast majority of other animals, but has three. Of these, the largest and most powerful heart, called the systemic heart, is located in the middle of the octopus's body and is responsible for pumping oxygenated blood throughout the body, but not to the gills.

What is also interesting is that the large heart stops beating when the octopus is swimming. The other two hearts are relatively smaller and weaker, and are called branchial hearts. Each branchial heart is attached to one of the octopus's gills to pump blood through the gills, which is why they are also called gill hearts.

Why do octopuses need three hearts?

Animals also need enough blood pressure to efficiently move blood around their bodies, says Kirt Onthank, a biologist at Walla Walla University. The octopus’s gills draw vital oxygen from the water, and then its two branching hearts pump less oxygenated blood through the gills.

Unlike other animals, octopuses must have three hearts to sustain life.

However, the blood passing through the gills becomes oxygen-rich and has low pressure, which is not good for the blood to be transported to the organs in the body. This forces the octopus to need another heart behind the gills, also known as the systemic heart, to pressurize the blood again, thereby helping to push the oxygen-rich blood throughout the body effectively.

How many brains does an octopus have?

The octopus's nine brains include one main brain, which is responsible for analyzing and making decisions for it, and the remaining eight sub-brains. These sub-brains are located at the base of each arm (tentacle). When information is received, it is transmitted to the sub-brains and processed and transferred to the main brain.

The head contains a large brain with a brain-to-body ratio similar to that of other intelligent animals. The nervous system is complex with about 500 million neurons, but these neurons are not concentrated in the brain but distributed in a network of ganglia linked to three main parts. The central brain contains only about 10% of the neurons. The two large eye lobes contain about 30%. The remaining 60% are located in the tentacles.

Octopuses have one main brain and eight secondary brains.

How many tentacles does an octopus have? How many suckers?

Octopuses have a total of eight tentacles. It has long been thought that octopuses use four of their tentacles to move (called legs) and the remaining four to eat and grasp (called hands).

After collecting data from 2,000 different monitoring sessions, marine experts from 20 marine life research centers across Europe discovered that the octopus moves on only two tentacles and uses the remaining six to feed.

Another strange thing is that they only use two legs to push when they want to swim. The other tentacles act as oars, helping the octopus swim. On the eight tentacles, there are a total of 240 suckers. They rely on these suckers to cling to the sea floor and move. On the tentacles of the octopus, there are also tactile organs and taste organs, which help to judge whether the "spoils" are edible or not.

Tuyet Anh (Source: Synthesis)

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Source: https://vtc.vn/bach-tuoc-la-loai-vat-co-may-tim-ar801259.html