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Sponges have no nervous systems, their middle jelly-like layers have large and varied populations of cells, and some types of cell in their outer layers may move into the middle layer and change their functions
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∙ 12y ago
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What has a nervous system but no brain 1 earthworm 2 hydra 3 cockroach 4 amoeba?
hydraMany lower invertebrates lack a brain but do possess a central nervous system. These include jellyfish, starfish, and sponges.
Which animals does not have nervous system?
A ganglia is a collection of nerve cell bodies. The hydra do not have ganglia. Instead, they have special cells for detecting touch.
Does the central nervous system consist of the somatic nervous system?
No. Nervous System is comprised of the Central Nervous System (CNS) and the Peripheral Nervous System (PNS) The PNS is comprised of the Somatic Nervous System and the Autonomic Nervous System The Autonomic Nervous System is comprised of the Sympathetic Nervous System, the Parasympathetic Nervous System and the Enteric Nervous System
The portion of the nervous system away from the central nervous system?
peripheral nervous system
What are the two types of nervous system?
They are the central nervous system and the periperhal nervous system.but in the periperhal nervous system ,they are two nervous system divided，。
Do starfish have cephalization?
"Cephalization" means that the animal has a defined "head" region in which there is a lot of nervous tissue (such as the brain in humans). Sponges are not cephalized because they do not have defined head region nor do they have a central location for their nervous system. The nervous system in sponges is very loose because their cells generally work more individually as opposed to being commanded by a nervous system.
How would life be with out the nervous system?
Without the nervous system, we would have only primitive, unintelligent organisms such as sponges and jellyfish. There would be no one to post questions or to answer them. This website would fall out of use.
What system do the cnidaria and comb jellies have that sponges lack?
Despite neither jellies nor sponges having central nervous systems, jellies have true tissues. The cells in jellyfish are also bound together, unlike in sponges.
What has a nervous system but no brain 1 earthworm 2 hydra 3 cockroach 4 amoeba?
hydraMany lower invertebrates lack a brain but do possess a central nervous system. These include jellyfish, starfish, and sponges.
Which animals does not have nervous system?
A ganglia is a collection of nerve cell bodies. The hydra do not have ganglia. Instead, they have special cells for detecting touch.
Simplest kind of invertebrates?
The simplest kind of invertebrates would be sea sponges. They are part of the phylum Porifera and are the only animals that do not have a nervous system at all.
What organ system does the brain belong too?
The nervous system The central nervous system
Do sponges have blood?
Sponges do not have blood. They do not have a circulatory system either.
Does the central nervous system consist of the somatic nervous system?
No. Nervous System is comprised of the Central Nervous System (CNS) and the Peripheral Nervous System (PNS) The PNS is comprised of the Somatic Nervous System and the Autonomic Nervous System The Autonomic Nervous System is comprised of the Sympathetic Nervous System, the Parasympathetic Nervous System and the Enteric Nervous System
What comprises the nervous system?
The Sympathetic Nervous System and the Parasympathetic Nervous System
Do sponges have a support system?
No
The portion of the nervous system away from the central nervous system?
peripheral nervous system
