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 approach 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.

Interestingly, the larger 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 attaches to one of the octopus's gills to pump blood through the gills, hence their name gill hearts.

Why does an octopus 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’ gills draw vital oxygen from the water, and then its two branched hearts pump less oxygenated blood through the gills.

Unlike other animals, the octopus 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 has nine brains, including one main brain, which analyzes and makes decisions for it, and eight secondary brains. These secondary brains are located at the base of each arm (tentacle). When information is received, it is transmitted to the secondary brains and processed and transferred back 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 connecting 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 1 main brain and 8 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 tentacles to move (called legs) and the remaining four tentacles 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 themselves when they want to swim. The other tentacles act as oars, helping the octopus swim. There are 240 suction cups on the eight tentacles. They rely on these suction cups to cling to the seabed and move. The octopus tentacles also have tactile and taste organs, which help determine whether the "spoils" they collect 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