Which is not true on the statements below? There are three states of a neuron possible. A. Resting neuron-with a normal intraneuronal potential of-65 millivolts. B. Neuron in an excited state-with a less negative intraneuronal potential (-45 millivolts) caused by sodium influx. C. Neuron in an inhibited state with a more negative intraneuronal membrane potential (-70 millivolts) caused by potassium ion efflux, chloride ion influx, or both.

SYNAPTIC PHYSIOLOGY

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	A
B	B
C	C
D	none of the above
E	all of the above

Explanation:

Detailed explanation-1: -The action potential has three main stages: depolarization, repolarization, and hyperpolarization. Depolarization is caused when positively charged sodium ions rush into a neuron with the opening of voltage-gated sodium channels.

Detailed explanation-2: -Resting membrane is impermeable to negatively charged proteins present in the axoplasm. vi. The ionic gradients across the resting membrane are maintained by the active transport of ions by the sodium-potassium pump.

Detailed explanation-3: -The resting membrane potential of a neuron is about-70 mV (mV=millivolt)-this means that the inside of the neuron is 70 mV less than the outside. At rest, there are relatively more sodium ions outside the neuron and more potassium ions inside that neuron.

Detailed explanation-4: -In humans this is said to be around-70 mV. This means that the inside of the cell is negatively charged in comparison to the outside. Resting membrane potentials are maintained by two different types of ion channels: the sodium-potassium pump and the sodium and potassium leak channels.

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