A mysterious jellyfish floating in the sea with a translucent body.
When I see them swimming around in the aquarium, I think carelessly, “Jealousy must not have any worries.” Of course, there is nothing to worry about, and jellyfish do not have a brain smile itself.
… uh!? How do you swim and eat when you don’t have a brain!? Or no heart, no blood? Uh… aliens? This time we have come to such a jellyfish ecology trivia!
Jellyfish have no heart, brain, or blood.
Jellyfish’s blood is seawater and the whole body is heart! I don’t need a brain!
First, jellyfish do not have a brain, so how they swim and eat is made possible by the reflexes of nerves around their bodies.
We humans usually move our hands and feet only when ordered by the brain, but when we touch the hot thing, we omit the brain’s command and let go of our hands reflexively. It’s a strange story, but jellyfish routinely move using this reflex, so they don’t need commands from the brain. Therefore, the brain itself does not exist.
I see… The strange thing remains the same, but I can understand for now. But if you don’t circulate blood and transport nutrients all over your body, you don’t make it to life. You don’t have a heart and blood What do you mean?
In this regard, jellyfish distribute nutrients throughout the body by circulating seawater introduced into the body.
Yes, it is necessary for the nutrients to spread, so you don’t necessarily need the blood to play that role. And the role of the pump that circulates the seawater is to swim by opening and closing an umbrella, a jellyfish with its whole body like a heart.
Well, let’s take an image so far and watch the jellyfish video below! The jellyfish itself looks like a heart for a moment!
Jellyfish only have one intestine.
Jellyfish have very simple guts, and they have an organ called a “gastric relationship” in which digestive and circulatory organs are combined into one. If you eat plankton, which is a food and seawater, with the mouth attached to the center of the umbrella, you digest it through this gastric relationship and spit it out again through your mouth.
The movement from the introduction of the necessary nutrients to the spitting out of the unnecessary is completed in one organ. In other words, there is little need for complex movements to sustain life. How the guts work is also one of the reasons why the brain and heart are not needed.
In addition, sea anemones and corals also have internal organs of the same structure, so they are collectively called alveoli animals (alveoli animals).
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