An action potential in one segment of axon causes adjacent sections of axon membrane to reach threshold through what mechanism?
na+ ions diffusing across the membrane through leakage channels the generation of local currents
k+ ions diffusing through voltage-gated channels neurotransmitters causing chemically gated channels to open

Na+ ions diffusing across the membrane through leakage channels the generation of local currents

Explanation:

An action potential occurs when the membrane potential of a specific cell location rapidly rises and falls. There is a voltage difference between the exterior and interior of the cell, called the membrane potential, due the Na+/K+ ATPase pump.  

Starting from the resting potential, the action potential starts when the thershold is reached when Na+ ions difusse across the membrane through channels.Then, the interior of the cell becomes positive and the exterior negative.

The K+ channels take place when the repolarization phase stars, letting K+ ions difusse from the inside of the cells to the exterior.  

yea hi

explanation:

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.