5b of 70 Review What type of conduction takes place in unmyelinated axons? View Available Hint(s)
O Synaptic transmission O Electrical conduction O Continuous conduction O Saltatory conduction Submit Part B An action potential is self-regenerating because View Available Hint(s) O repolarizing currents established by the efflux of Naflow down the axon and trigger an action potential at the next segment O depolarizing currents established by the influx of Nat flow down the axon and trigger an action potential at the next segment O repolarizing currents established by the efflux of Kflow down the axon and trigger an action potential at the next segment O depolarizing currents established by the influx of segment flow down the axon and trigger an action potential at the next A Revi Why does regeneration of the action potential occur in one direction, rather than in two directions? View Available Hint(s) The activation gates of voltage-gated Nat channels close in the node, or segment, that has just depolarized. The activation gates of voltage-gated K channels open in the node, or segment that has just depolarized. The inactivation gates of voltage-gated Na+ channels close in the node, or segment, that has just fired an action potential. The inactivation gates of voltage-gated K* channels close in the node, or segment, that has just fired an action potential. Submit Part D What is the function of the myelin sheath? ► View Available Hint(s) O The myelin sheath decreases the resistance of the axonal membrane to the flow of charge. O The myelin sheath decreases the speed of action potential conduction from the initial segment to the axon terminals.
O The myelin sheath increases the insulation along the entire length of the axon. O The myelin sheath increases the speed of action potential conduction from the initial segment to the axon terminals.
Submit Part E What changes occur to voltage-gated Na+ and k channels at the peak of depolarization? View Available Hint(s)
O Activation gates of voltage-gated Na+ channels close, while inactivation gates of voltage-gated K channels open.
O Activation gates of voltage-gated Na+ channels close, while activation gates of voltage-gated K* channels open. O Inactivation gates of voltage-gated Na+ channels close, while inactivation gates of voltage-gated K* channels open. O Inactivation gates of voltage-gated Nat channels close, while activation gates of voltage-gated K channels open. Submit Part F In which type of axon will velocity of action potential conduction be the fastest? View Available Hint(s) Unmyelinated axons with the largest diameter Unmyelinated axons of the shortest length Myelinated axons with the largest diameter Myelinated axons with the smallest diameters Submit