Classify each of the following statements as being descriptive of graded potenti
ID: 3475070 • Letter: C
Question
Classify each of the following statements as being descriptive of graded potentials or action potentials. Graded Potential Can be a depolarization or a hyperpolarization. Has no threshold Has a refractory period Has no refractory period Mechanism depends on voltage-gated channels. Can be summed Initiated by a graded potential. All-or-none Action Potential Threshold is usually about 15 mV depolarized relative to the resting potential Is conducted without decrement. Amplitude varies with size of the initiating event. Is only a depolarization. Is conducted decrementally; that is, amplitude decreases with distance Cannot be summed Mechanism depends on ligand- gated channels or other chemical or physical changes. ResetExplanation / Answer
graded ptential has no threshold where as action potential has threshold taht is usually 15 mv depolarisation relative to the relative potential
GRADED POTENTIAL: DEPENDING UP ON THE stimulus and it can be depolarisation and hyperpolarisation where as in action potential always lead to depolarisation of membrane and reversal of the membrane potential
no refractory period in the graded potential where as absolute and relative refractory periods are important aspects of action potential.
garded potential can be summed overtime and across the space (spatial summation) where as in action potential summation is not possible with action potentials
amplitude is generally small in graded potential where as action potential has large amplitude
ion channels are responsible for graded potentials may be ligand gated ,mechanosensitive,or temperature sensitive channels or may be channels that are gated by cytoplasmic signalling molecules. in action potential voltage gated na+ and k+are responsible for neuronal action potential
amplitude diminshes as graded potential travel away from the initial site (decremental) where as in action potential amplitude does not diminish as action potentials propagate along neuronal projections.
graded potentials are brought about by external stimuli or by neurotransmitters released in the synapse where they cause graded potentials in the post synaptic cell . where as in action potential are triggered by membrane depolarisation to thershold graded potentials are responsible for the initial membrane dipolarisation to threshold
amplitude is proportional to the strength of the stimulus in the graded potential where as in action potential amplitude is all or none ,strength of the stimulus is coded in the frequency of all-or-none action potential generated
in graded potentials sodium, pottassium or chlorine are involved where as in action potential only sodium and pottassium involved