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Starfish do not have true brains. They have a cluster of nerves called ganglia that form a ring in the centre of the starfish which is called the circumoral nerve ring. A radial nerve extends at right angles from the circumoral nerve ring into each arm. With the exception of eye spots in the tip of each arm there are no specialised sense organs (such as eyes or ears). These eyespots sense light and send back messages to the main nerve centre.
The starfish is a primitive organism and as such does not make conscious decisions to eat or sleep. Changes in light intensity will cause different firing rates of nerves, which may equate to sleep. Minute traces of odours from clams and mussels or from dead fish will also excite the nervous system and will initiate the feeding cycle. A lot of these "sleep/wake" cycles or feeding cycles will be dictated by changes in light intensity or tidal rise and fall.
All the best
Starfish do not have true brains. They have a cluster of nerves called ganglia that form a ring in the centre of the starfish which is called the circumoral nerve ring. A radial nerve extends at right angles from the circumoral nerve ring into each arm. With the exception of eye spots in the tip of each arm there are no specialised sense organs (such as eyes or ears). These eyespots sense light and send back messages to the main nerve centre.
The starfish is a primitive organism and as such does not make conscious decisions to eat or sleep. Changes in light intensity will cause different firing rates of nerves, which may equate to sleep. Minute traces of odours from clams and mussels or from dead fish will also excite the nervous system and will initiate the feeding cycle. A lot of these "sleep/wake" cycles or feeding cycles will be dictated by changes in light intensity or tidal rise and fall.
All the best
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∙ 12y ago
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What are the brainless animals?
A jellyfish & a starfish A Jellyfish has no brain & no heart A starfish has no brain & no blood
Does a seastar have a brain?
Sea Star is the nickname. The official name is Starfish. Yes, the starfish has a brain. A distributed brain. Starfish have a complex network of interlacing nerves in each arm ehich all connect to the brain.
What is an IQ for a starfish?
A starfish has no brain, so IQ=0
What animal have no brain?
starfish
What animal has 5 arms and no brain?
Starfish have five arms and no brain.
What system does a sea star NOT have?
Starfish do not have a brain.
What organs are not present in starfish?
The brain is one.
Why starfish don't have brain?
Because Starfish are Inverterbrites, nature has made it so they dont require a brain to survive. In effect this means that all the processes that happen inside are starfish are very simple and interconnected
How do starfish know what to do if they don't have a brain?
Starfish do have neurons, despite not having a brain... this allows it to "perceive" stimuli and to react to them automatically, like a reflex, without needing a brain to process anything.
Do starfish have feelings too?
Most likely not. Starfish do not have a brain or central nervous system, and instead have a ganglia.
What organ does the star fish not have?
Starfish don't have a heart, or a brain...
Is a starfish dumb?
the starfish does not have a brain it is made up of nerve cells that control it's functions A starfish doesn't have a brain in its head like we do. Instead their entire nervous system acts like a distributed brain. So, it has a brain, just not like ours.
