A graded potential arrives at the dendrite and depolarises the inside of the neuron. What specific condition has to be m

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A graded potential arrives at the dendrite and depolarises the
inside of the neuron. What specific condition has to be met, in
order for this to result in the firing of an action potential ? ( 1
mark)
Via what mechanism can a single postganglionic autonomic cell
affect a large area of target tissue? (1 mark)
During your sensory physiology lab class you touched your lab
partners skin at 2 points using a pair of dividers, however your
lab partner only felt touch at one point. What is the most likely
explanation for this happening? (3 marks)