Animalscaretips
- How does a cnidarian nervous system work?
- How does a jellyfish function without a brain?
- Why do cnidarians have diffused nervous system?
- How do cnidarians and echinoderms function and perform behaviors without having a brain?
- Do cnidarians have a brain?
- What characteristics of phylum Cnidaria are most important in distinguishing it from other phyla what type of larval form do they have?
- What creature has no brain?
- What animal has 32 brains?
- How do starfish function without a brain?
- What type of nervous system does a cnidarian have?
- What is unique about the nervous system of cnidarians?
- What role do cnidarians have in the environment?
- How do cnidarians protect themselves?
- Does central nervous system present or absent in Sea Star flatworm octopus and human?
- Which of the following have primitive nerve net but no brain?
How does a cnidarian nervous system work?
The basic plan of the cnidarian nervous system is that of a nerve net which, at some locations, has condensed to form nerve plexuses, or circular or longitudinal nerve tracts which may be syncytia.
How does a jellyfish function without a brain?
Jellyfish have no brain, but they do have a rudimentary nervous system! ... These nerves serve as sensory organs that detect touch, temperature, salinity, etc., and the jellyfish react reflexively to these stimuli. Their neurons are interspersed in the various body layers of the jellyfish.
Why do cnidarians have diffused nervous system?
In the cnidarian body, the nerve net serves as a sensory locator; neuron cells stretch all around the animal's body and allow the cnidarian to detect chemical changes, to capture prey, and to move in response to a stimulus. This kind of expansive nerve net is also known as a diffuse nerve net.
How do cnidarians and echinoderms function and perform behaviors without having a brain?
SIMPLE NERVE NETS IN CNIDARIANS AND ECHINODERMS. Cnidarians (jellyfish and anemones, also sometimes called coelenterates) have neurons but no centralized brain. They still manage to organize fairly complex behaviors. ... The stinging organs of cnidarians, nematocysts, discharge without nervous control.
Do cnidarians have a brain?
Cnidarians are generally thought to have no brains or even central nervous systems. However, they do have integrative areas of neural tissue that could be considered some form of centralization.
What characteristics of phylum Cnidaria are most important in distinguishing it from other phyla what type of larval form do they have?
What characteristics of Phylum Cnidaria are the most important in distinguishing it from other phyla? They are sessile, radial symmetry, production of nematocysts.
What creature has no brain?
There is one organism that has no brain or nervous tissue of any kind: the sponge. Sponges are simple animals, surviving on the sea floor by taking nutrients into their porous bodies.
What animal has 32 brains?
Leech has 32 brains. A leech's internal structure is segregated into 32 separate segments, and each of these segments has its own brain. Leech is an annelid.
How do starfish function without a brain?
Despite the absence of a brain, a sea star does have a nervous system, albeit a simple one. Surrounding its mouth is a nerve ring that's connected to each of its arms via a radial nerve. ... This sensory setup enables the sea star to feel and make important decisions for survival, from finding food to avoiding danger.
What type of nervous system does a cnidarian have?
Cnidarians have nerve cells that are organized in a nerve net – a diffuse network where neurons interact wherever they cross one another. There are two contrasting types of body symmetry: radial and bilateral. Nerve nets are associated with the former and central nervous systems with the latter.
What is unique about the nervous system of cnidarians?
The nerve net is the simplest form of a nervous system found in multicellular organisms. Unlike central nervous systems, where neurons are typically grouped together, neurons found in nerve nets are spread apart. This nervous system allows cnidarians to respond to physical contact.
What role do cnidarians have in the environment?
Cnidarians are integral parts of the marine ecosystem where they may engage in symbiotic relationships with other organisms and where their predatory activities contribute to the delicate balance of the oceanic food chain.
How do cnidarians protect themselves?
Cnidarians defend themselves and catch prey using their tentacles, which have cells called cnidocytes at their tips.
Does central nervous system present or absent in Sea Star flatworm octopus and human?
Flatworms of the phylum Platyhelminthes have both a central nervous system (CNS), made up of a small “brain” and two nerve cords, and a peripheral nervous system (PNS) containing a system of nerves that extend throughout the body.
Which of the following have primitive nerve net but no brain?
Hydra which belongs to the phylum coelenterata has nerve cells but no brain. Its nervous system consists of nerve cells and their processes.
