Nervous System Flashcards
role of nervous system
integrate info and decide on an appropriate response
sensory neurons
detect important internal and external stimuli
central nervous system (interneurons)
integrate information in its current context and with recent history to produce the most appropriate output
majority of cells in nervous system
interneurons
morot neurons
carry the output of the central nervous system to the effector cells that produce the appropriate response
neurons
the functional unit of the nervous system
receive and transmit info
transduction
conversion of energy from one form to another
GLIA
supporting cells in the nervous system that fulfill a variety of important rolls
roles of GLIA
structural support maintenance of ionic compositions remove extra chemicals insulate neurons electrically formation of blood brain barrier provide a path for developing neurons secretion of compounds for neuronal maintenance participate in flow in the nervous system
membrane potential
language of neurons
potential difference across their plasma membrane
Vm
equilibrium
electrical gradient and concentrating gradient balance out
two factors affect movement of ions
concentration gradient
charge
synaptic transmission
cell to cell communications
electrical synapses ( gap junctions)
provide a direct connection between cells.
very fast, reliable, limited to flexibility
formed by proteins called connexons
excitatory (depolarizing) na+ ca2+ channels
moves cell closer to threshold
