In synaptic transmission, which cell is the target cell?

[a] neurotransmitter was released when in the experiment having no Ca++ in the extracellular fluid because [b] is Ca++ dependent.

Mg++ [a] the effect of extracellular calcium by blocking [b] and [c] neurotransmitter release.

What change in membrane potential triggers the action potential? 

Under resting conditions potassium ions move ___ the neuron through ____ channels.

Put the events occurring at a ligand gated channel in the correct order.

Stronger stimuli are able to increase the frequency of action potentials by intruding on the:

What happened to the amount of neurotransmitter release when you switched from the extracellular fluid with no Ca++ to the extracellular fluid with low Ca?

The absolute refractory period is the result of [x] voltage gated channels being [y], which means that they cannot be opened regardless of stimulus strength.  (refer to the Vander textbook if needed.)

Activity 5:  How does the absolute refractory period ensure directionality of action potential propagation? Include the role of Na+ voltage gated channels.