A myelinated axon conducts nerve impulses at a speed of 40 m/s. If the myelination made the speed of action potential increase by a factor of 50 and time constant is 1ms, what is the space constant for the unmyelinated axon? Aunmyelinated X mm

A membrane potential (Vm) labeled axis on the graph In the graph draw the phases of the action potential Include the channels involved and when they open and close matching them to the Vm Indicate the periods in which the action potential can or cannot occur

A A Aa v Ao O... 11 AaBbCcDdEe AaBbCcDc AaBbCcDdE AaBb( AaBbCcDdEE AaBbCcDdEe U v ab A ev A v X, Normal No Spacing Heading 1 Heading 2 Title Subtitle temporal summation spatial summation Unidirectional and non-degrading Action potential o Depolarization; Na gates opening o Repolarization: K gates opening o Hyperpolarization: K gates closing Movement down an axon Refractory periods Myelin and Axon size effect Action potential stimulated release Neurotransmitter (NT) recycling Neurotransmitters o Acetylcholine Biological amines (Serotonin, norepinephrine and epinephrine) Single amino acids (Glutamate and GABA) Fast and Slow effects and Receptor effects The Autonomic System Division definition

Assuming a typical EPSP of 0.5mV, approximately how many simultaneous EPSP's would be required to bring a typical neuron to threshold?

rearrange these in the correct order of events in an action potential.

A True OUTSIDE CELL This cell is at rest. False INSIDE CELL C D T E

Name and describe the roles of key molecules and membrane structures in maintaining axon membrane resting potential of-70 mV Name and describe the roles of key molecules and membrane structures in propagation of axon membrane action potentials during depolarization at +35 mV  Explain why they myelin sheath of white matter neurons allows faster action potential transmission than that of neurons found in gray matter.

1.25 p Question 22 Which statement below best describes why action potentials travel in only one direction? O The all-or-none principle explains this. O They have a refractory period. O The diameter of the axon explains this. O Only sodium- and potassium-gated channels are found on the axon. O They have myelinated axons. • Previous Next Not saved Submi

An action potential Membrane potential (mV) -40 40 -65 II -80 0 -Overshoot Rising Falling phase phase III Voltage threshold Resting potential Undershoot 1 2 3 4 Time (ms) In the figure above, which arrow best represents the point where the voltage-gated sodium channels are inactivated and locked? OI ○ III O IV ○ II

Nernst (equilibrium) Potential (mV) - 6.lol 0.07 0.125 D.094 lon Intracellular Extracellular Concentration (mM) Concentration (mM) K* 155 4 Nat 12 145 Ca** 104 1.5 4 120 D) If during the generation of an action potential in the skeletal muscle cell the membrane potential approaches +65 mV, membrane permeability for which ion likely plays a major role in membrane depolarization? Explain your choice.