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NERVOUS SYSTEM (Type of sensory receptor (Thermoreceptor
cold and hot…
NERVOUS SYSTEM
Type of sensory receptor
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Mechanoreceptor
stimulated by pressure, touch, stretch,motion and sound
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Neurons
- structural and functional unit of nervous system
- communicate in the form of nerve impulse
consist of:
1. dendrites
- cell body
- axon
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CNS & PNS in vertebrates
CNS ( brain & spinal cord )
receives sensory input from PNS, integrates and initiate motor output
PNS ( nerves branching out from CNS )
carries sensory information to CNS and sends command to glands and muscle
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Function
- Sensory input
- Integration
- Motor output
Cephalization in invertebrates
brain as centre for integration and formed from concentration of neuron in head region
- appears in planarian, annelid, arthropod and molusk
Receptor Mechanism
- stimulus energy converted to membrane potential
- weak stimulus energy is amplified
- signals from receptor integrated through summation of graded potential