Q. No.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
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
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
At Resting condition, the neuron membrane is
(1) Negative from outside
(2) Negative from inside
(3) Positive from inside
(4) Both A and C
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
The………. difference across the resting membrane is called as Resting potential.
(1) Electrochemical potential
(2) Electrical potential
(3) Chemical
(4) Chemiosmotic
The rise in stimulus-induced permeability to
a. Potassium ions
b. Sodium ions
c. Restoring RMP
d. Diffusion of potassium ions
Arrange them in order.
1. b-a-c-d
2. a-b-c-d
3. b-a-d-c
4. c-a-d-b
In a chemical synapse, when an impulse arrives at the axon terminal, it:
1. leads to the opening of the calcium channels at the post-synaptic membrane.
2. Stimulates the fusion of synaptic vesicles towards the pre-synaptic membrane.
3. causes the binding of the neurotransmitter of its receptors on the post-synaptic neuron.
4. activates the opening of the potassium channels in the axon terminal.
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
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
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