The action potential was recorded intracellularly from a squid giant axon bathed in two types of fluid such as sea water and artificial sea water having lower concentration of sodium […]
Tag: CSIR NET Life Science Previous Year Questions and Solution on Nervous system
Tag: CSIR NET Life Science Previous Year Questions and Solution on Nervous system
CSIR NET Life Science Previous Year Questions and Solution on Nervous system
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CSIR NET Life Science Previous Year Questions and Solution on Animal Physiology
Physico-Chemical and Biological Basis of Resting Membrane Potential in Neurons
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- September 8, 2025
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A potential difference of about -70 mV between inside and outside of a single axonal membrane in resting condition may be recorded by suitable electrodes and amplifier. The physico-chemical and […]
CSIR NET Life Science Previous Year Questions and Solution on Animal Physiology
Mechanism of After-Hyperpolarization in Nerve Fiber Action Potentials: The Role of Potassium Conductance
An action potential of a nerve fibre is described by different components including after-hyperpolarization. The mechanism of generation of this after- hyperpolarization has been proposed in the following statements: A. […]
CSIR NET Life Science Previous Year Questions and Solution on Animal Physiology
Why a Nerve Fiber Cannot Generate a Second Action Potential During the Absolute Refractory Period
An action potential was generated on a nerve fibre by a threshold electrical stimulus. When a second stimulus was applied, no matter how strong it was, during the absolute refractory […]
CSIR NET Life Science Previous Year Questions and Solution on Animal Physiology
Why a Nerve Fiber Cannot Be Stimulated During the Absolute Refractory Period
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- September 8, 2025
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A nerve fibre cannot be stimulated during the absolute refractory period of a previous stimulation because (1) Sodium permeability remains high. (2) Sodium-potassium pump does not operate. (3) Voltage-gated calcium […]
CSIR NET Life Science Previous Year Questions and Solution on Animal Physiology
Understanding Nerve Fiber Accommodation: Why Action Potentials Fail Despite Threshold Stimulus
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- September 8, 2025
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When a nerve fiber is stimulated with increasing strength of stimulus, the action potential fails to generate even though the threshold level may be passed. The following statements may explain […]
CSIR NET Life Science Previous Year Questions and Solution on Animal Physiology
Explaining the Overshoot Phase in Action Potential of Giant Squid Axon: Roles of Sodium and Potassium Conductance
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- September 8, 2025
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The membrane potential in a giant squid axon recorded intracellularly at the resting condition (-70 mV) was reversed at the peak of action potential (+35 mV) after stimulation of the […]
CSIR NET Life Science Previous Year Questions and Solution on Animal Physiology
Understanding Action Potential Initiation at the Axon Hillock and Directional Conduction in Neurons
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- September 8, 2025
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In the nervous system, the action potential is generated at the axon hillock in physiological conditions and it is conducted to the terminal end of axon. The location specific origin […]
CSIR NET Life Science Previous Year Questions and Solution on Animal Physiology
Depolarization Phase of Action Potential: Role of Sodium Ion Influx
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- September 8, 2025
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During generation of an action potential, depolarization is due to (1) K+ efflux (2) Na+ efflux (3) Na+ influx (4) K+ influx Introduction The generation of an action potential is […]
CSIR NET Life Science Previous Year Questions and Solution on Animal Physiology
The Key Function of Microglia Cells in the Brain: Scavenging Injured Cell Debris
Which one of the following functions is correct for the microglia cells in the brain? (1) Myelin formation (2) Making blood-brain barrier (3) Scavenging injured cell debris (4) Enveloping synapses […]
