Please enable JavaScript.
Coggle requires JavaScript to display documents.
Signaling and Locomotion (Nervous System (Neuron Structure (Dendrites
…
Signaling and Locomotion
Nervous System
Organization
Central Nervous System
Brain
-
Parts
Midbrain
(vision, hearing, alertness)
Hindbrain
(breathing, circulation, digestion, balance)
Forebrain
(voluntary movement, speech, memory, learning, emotions, homeostasis)
-
-
Functions
-
-
Sensory Input
(by sensory neurons; part of PNS)
(sensory receptors detect stimuli and transmit information to CNS)
-
Signal Transduction
Resting Potential
maintained by Na/K pump
interior negative relative to exterior
higher concentration of Na+ ions on the outside
higher concentration of K+ ions on the inside
Action Potential
-
Threshold and Depolarization (if stimulus is sufficiently strong):
more Na channels open
a lot of Na + ions flow in
interior becomes positive relative to exterior
Repolarization:
Na channels close
K channels open
a lot of K+ ions flow out
interior becomes negative relative to exterior
Refractory Period:
Na/K returns concentrations of Na+ and K+ ions back to resting state
(3 Na+ ions pumped out for every 2 K+ ions pumped in)
Signal Propagation:
next part of axon stimulated to undergo action potential
electrical impulse travels down length of axon
Chemical Synapses
-
-
-
Receptors either stimulated or inhibited
Ion channels may open to stimulate action potential in receiving neuron
-
Sensory Receptors
Types
-
Chemoreceptors (detect chemicals: taste, smell)
-
Mechanoreceptors (detect pressure: touch, sound)
Thermoreceptors (detect temperature: heat, cold)
Sensory Transduction
(sensory stimuli converted to electrical signal, which can be passed to neurons through neurotransmitters)
-