Q. No.Neurons are excitable cells because
(1) Their membranes are in unpolarized state
(2) There membranes are very light to create channels
(3) They have got neurotransmitters
(4) Their membranes are in polarized state
(1) Their membranes are in unpolarized state
(2) There membranes are very light to create channels
(3) They have got neurotransmitters
(4) Their membranes are in polarized state
The membrane of neuron is polarized because
(1) Different kind of lipids are there over membrane
(2) Different kinds of ion channels are there in membrane
(3) These ion channels are selectively permeable to different ions
(4) Both B and C
When neuron is resting, which of the following is false with respect to that
(1) It is not conducting any impulse
(2) Axonal membrane is more permeable to potassium ions
(3) Axonal membrane won't allow any flow of sodium ions across it
(4) Membrane is impermeable to negatively charged proteins
Which of the following conditions are not true across resting membrane?
(1) Axoplasm has more number of Potassium ions
(2) Axoplasm has less number of sodium ions
(3) High Concentration of negatively charged proteins in fluid outside axoplasm
(4) Both B and C
Ionic gradients across the resting membrane are maintained by
(1) Active transport of ions
(2) RMP
(3) Impulse or stimulus
(4) Both A and B
Sodium potassium pump in neuronal membranes is
(1) Responsible for transfer of 3 sodium outwards and two potassium inwards
(2) Responsible for 2 sodium outwards and three potassium inwards
(3) Responsible for 2 sodium and three potassium inwards
(4) Responsible for 2 sodium and three potassium outwards
At Resting condition, the neuron membrane is
(1) Negative from outside
(2) Negative from inside
(3) Positive from inside
(4) Both A and C
The………. difference across the resting membrane is called as Resting potential.
(1) Electrochemical potential
(2) Electrical potential
(3) Chemical
(4) Chemiosmotic
When a stimulus is applied at a site over neuron membrane
(1) It becomes freely permeable to Sodium ions
(2) It becomes freely permeable to potassium ions
(3) It causes reversal of polarity from positive to negative on inner side
(4) Both A and C
The polarity of the membrane at site A is reversed ie inside of the membrane becomes changed from negative to positive
1. Called as depolarization
2. Called as repolarization
3. Called as polarization
4. Called as hyperpolarization
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