Question

Which is a characteristic of a graded potential?
A.The amplitude is always the same
B.The duration varies unlike action potential which is fixed
C.Always followed by a refractory period
D.An all or none response

Answer 1

Hint: Impermanent changes to the cell layer voltage can result from neurons accepting information from the surroundings, or from the activity of one neuron on another.

Complete answer:
Neighborhood changes in the membrane potential are called graded potentials and are typically connected with the dendrites of a neuron. The measure of progress in the membrane potential is dictated by the size of the stimulus that causes it.Graded potentials can be of two sorts, possibly they are depolarizing or hyperpolarizing . For a layer at the resting potential, an evaluated potential speaks to an adjustment in that voltage either above −70 mV or underneath −70 mV.
Whenever graded potential os arriving at the axon hillock depolarise the membrane to the threshold voltage or over, an activity potential is started. A reviewed potential which is over the limit voltage is known as suprathreshold graded potential and this creates an activity potential. Be that as it may if an potential is underneath limit voltage, it is known as a subthreshold graded potential and doesn't trigger an activity potential.

Hence the correct answer is OPTION(B)

Note: Graded potentials are corresponding in amplitude to the size of the input stimulus and may be depolarising or hyperpolarizing. They can be coordinated both transiently and spatially, travel inactively and consistently every which way. Likewise, they don't need voltage-gated channels and decay with good ways from the site of stimulation.