Channels, pumps, and ions (Oh my!)
This channel is activated by an electrical signal? (bonus points if you can name an example of this type of channel in the NS)
voltage gated
what two factors will increase the speed of an action potential?
increase diameter of axon, increase myelination
This autoimmune disease causes myelin sheats to degrade over time.
multiple sclerosis
which neurological pathway has many neurons connecting to one neuron?
converging
Which ACh receptor is a direct pathway?
nicotinic
Na/K ATPase
What is the timing between action potentials called? What does this communicate?
neural code, strength of stimulua
Which protein does botox interfere with? This causes muscles to not be able to move because NTs cannot be exocytosed.
snare
which neurological pathway has 1 neuron connecting to many neurons?
diverging
which ACh receptor causes an IPSP?
muscarnic
What channel open during depolarization? What channel opens during repolarization?
Na, K
What is the 'jumping between nodes of Ranvier called?
saltatory conducation
What substance is found in cigarettes and acts as an agonist for nicotinic receptors?
nicotine
What type of synapse is a conduction between the axons of the pre synaptic neuron and the dendrites of the post synaptic neuron?
axodendritic
what removes ACh from the synaptic cleft? What drug inhibits this enzyme?
acetylcholinesterase, nerve gas
Which channels open in response to an action potential reaching the pre synaptic terminal?
Ca
How is an AP able to jump from node to node without losing energy?
regeneration at the nodes using Na and K channels
What receptor does curare bind to and what effect does it have on the body?
nicotinic, antagonist
What type of synapse is a conduction between the axons of the pre synaptic neuron and the soma of the post synaptic neuron?
axosomatic
what happens when ACh binds to a nicotinic receptor?
Na enterc cell, K leaves
What must happen in order for absolute refractory period to shift into relative refractory period?
Na channels must shift from active to inactive then close
How do anesthetics (like procaine) block AP propagation?
bind to voltage-gated Na channels, stops polarization, stops conduction of AP
You decide to eat a tasty mushroom and then go into cardiac arrest. What did you injest?
muscarine
What type of synapse is a conduction between the axons of the pre synaptic neuron and the axons of the post synaptic neuron?
axoaxonic
What happens after ACh binds to a g protein?
G protein activated, diffuses through cytoplasm, k channel activated, k flows out of cell