nervous tissues Flashcards
what are the three functions of nervous system?
sensory receptor (detects internal and external stimuli), integration( processing of sensory info), and activation of effectors(muscles and glands respond)
what are the two structural divisions of nervous system?
central nervous system and peripheral nervous system
what does the CNS consist of?
brain and spinal cord
what are the functions of CNS
command centre, interprets sensory info, coordinates response
what does the PNS consist of>
cranial nerves, spinal nerves, ganglia and receptor’s
functions of the PNS?
relays info from body to CNS (sensory division) and relays info from CNS to body “motor division”
what are the two types of neural tissue?
Neurons and nerugolia
what are the functions/characteristics of neurons?
conduct electrical impulses, long lived, do not divide, high metabolic rate of O2 and glucose are critical
what are the four structural classifications of neurons?
multipolar, bipolar, unipolar, anaxonic
what does a multipolar neruon look like?
many dendrites single axon, most numerous neuron in cns and pns
what does a bipolar neuron look like?
2 processes extend from cell body, special sensory is ear and eye
what does a unipolar neuron look like?
1 process extends from cell body(most sensory neurons)
what does anaxonic neuron look like?
no axon dendrites only, rare, in brain and some sense organ
what are the three functional classifications of neurons?
sensory, motor and internueron
what does sensory (afferent ) neurons do?
transmit impulses towards CNS
bipolar or unipolar