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Neurons (excitable cells) => Information transmission
1) Sensory neurons (AFFERENT): detect stimuli in internal or external environment and sends neuronal information to CNS for processing
2) Integrating interneurons
3) Motor Neurons (EFFERENT)
: motor neurons connect to skeletal muscle, cardiac muscle, or smooth muscle. Interacts with glands.
Sensory (AFFERENT)
Detect stimuli or external environment and sends neuronal information to CNS for processing.
Motor Neurons (AFFERENT)
Motor neurons connec to skeletal muscle, cardiac muscle, or smooth muscle.
Interacts with glands.
Glia cells (non-excitable
supporting cells in the NS
CNS (central nervous system)
Brain and spinal cord
PNS (Peripheral Nervous System)
All neurons that extend out from the brain and spinal cord.
-motor neurons often part of PNS
Excitable cells
Vary their membrane potential
Other excitable cells:
Neurons
Muscles
Glands
Neurons
information transmission can vary their membrane potential to perform their physiological function
Functional Polarization:
a) input zone
b) integrating and trigger zone
c) conduction zone
d) output zone
Input zone:
where the inputs arrive at the neuron and are converted to analog electrical signals (signal transduction)
-converting NT release, change in membrane potential
-EPSP, IPSP
EPSP
Excitatory post synaptic potential
(+) depolarized
IPSP
Inhibitory post synaptic potential
(-) Hyperpolarized
Stimuli
external Ts odorant stimuli is an example.
Integrating and Trigger Zone:
Soma and axon hillock
-Converts analog inputs from the input zone into digital signals (AP-action potentials)
AP> 1m/s or AP< 120 m/s (varies)
Amperes
units of electrical currrent
resistance
impediment of current flow (Ohms)
conductance
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Author
Nizhoni83
ID
171629
Card Set
Exam one material
Description
Human Physiology
Updated
2012-09-18T05:29:12Z
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