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Unlike humans who have a big brain and lots of nerves to send signals down the body, the hermit crab and other crustaceans have a much more primitive system. They have a primitive ventral nerve cord and ganglia system similar to an earthworm. Hermit Crabs have good vision thanks to their compound eyes on stalks (although can't look below them) and sensory organs are found on the body. Like true crabs, hermit crabs have bristles and hairs all over their body - but mostly on their walking legs - which act as touch receptors. The long antennae of hermit crabs - longer than other crabs - have smell sensors, used to find their food. Smell detectors are also found on the legs. When a hermit crab walks over food, its legs smell it, and the chelipeds quickly grasp it and move it into the mouth.
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What are 3 differences crayfish have with annelids?
Crayfish, which are crustaceans, differ from annelids in several key ways: firstly, crayfish have an exoskeleton made of chitin, while annelids possess a segmented body covered by a moist cuticle. Secondly, crayfish exhibit jointed appendages for movement, whereas annelids have soft, segmented bodies with bristles (setae) for locomotion. Finally, crayfish have a complex nervous system with a brain and specialized sense organs, while annelids have a simpler nervous system with a nerve cord and ganglia.
What is a crayfish eyestalk?
It is a part of the nervous system localized in the head of the animal. It is form by the retina, neurons and glial cells. Vision is its main function.
Does the crayfish have a muscular system?
Crayfish have muscles. They need them to move.
What organ system does the brain belong too?
The nervous system The central nervous system
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 2 systems of a crayfish are most unlike human systems?
Exoskeleton: Crayfish have a hard shell, and no bones. That makes crayfish invertebrates (no spine). Gills: Crayfish respire underwater through gills, where humans use lungs. The circulatory system is the second one, the reason for this being that crayfish have no blood vessels (and humans obviously do).
What comprises the nervous system?
The Sympathetic Nervous System and the Parasympathetic Nervous System
What do crayfish symbolize?
It functions using the nervous system that is connected to the brain. The sex cells are most commited although many people doubt this! this term is used for crayfish hi sp
What are the swollen portions of the nerve cord called in a crayfish?
The swollen portions of the nerve cord in a crayfish are called ganglia. These ganglia serve as clusters of nerve cell bodies that process information and coordinate responses in the crayfish's nervous system. The largest ganglia, located in the head, function similarly to a brain, while others are distributed along the nerve cord throughout the body.
The portion of the nervous system away from the central nervous system?
The peripheral nervous system is the portion of the nervous system away from the central nervous system. It consists of nerves that connect the central nervous system to the rest of the body, including sensory and motor neurons. The peripheral nervous system is responsible for transmitting information to and from the central nervous system.
The cranial and spinal nerves form what nervous system?
the peripheral nervous system
Do crayfish have a skeletal system?
yes
