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Neuron System (Types of Sensory Receptor (Mechanoreceptor (stimulated by…
Neuron System
Types of Sensory Receptor
Thermoreceptor
Chemoreceptor
Pain receptor
fast pain
slow pain
Electromagnetic receptor
Mechanoreceptor
stimulated by physical deformation
pressure
touch
motion
sound
caused by mechanical energy
Skin's receptor
Meissner's corpuscle
Sensitive to light touch
Pacinian corpuscle
Sensitive to stronger pressure and vibration
Merkel's receptor
sensitive to vibration and texture
Ruffini's corpuscle
sensitive to skin stretch
Neurons
functional unit of nervous system
communicate in the form of nerve impulse
Structures
Cell body
Axon
cover by myelin sheath
Dendrites
Neuroglia
provide support and nourishment
In PNS
Schwann cells
functioning
Nodes of Ranvier
gaps
Types
Receptor mechanism
Sensory transduction
detection of stimulus
conversion of stimulus energy into membrane potential of sensory receptor.
Amplification
weak energy that carried out into nervous system
Sensory adaptation
decrease responsiveness during continuous stimulation
Introduction
neural network that coordinate voluntary and involuntary actions between different body parts
Cephalization
center of neuron in the brain
Components of nervous system
Central nervous system (CNS)
brain & spinal cord
receives signal from PNS and initiates motor command
Peripheral nervous system (PNS)
All the nerves that branched out from CNS
carry sensory information to CNS and send motor command to the muscles and glands.
Somatic nervous system
Voluntary actions
Autonomic nervous system
Involuntary actions
Parasympathetic
in the relaxed state
Sympathetic
in the active state