🩺 NEET🧬 Biology

Neural Control and Coordination

2 solved NEET Biology previous year questions on Neural Control and Coordination, each with the correct answer and a full explanation.

The junction between the axon of one neuron and the dendrite of the next is called

aconstant bridge

bjunction point

ca joint

da synapse.

✓ Correct answer: d) a synapse.

ExplanationCorrect Answer: D Explanation: The junction between the axon of one neuron and the dendrite (or cell body) of another neuron is called a synapse.At the synapse, nerve impulses are transmitted from one neuron to the next through chemical neurotransmitters (or sometimes electrically).Constant bridge, junction point, and a joint are not biological terms used for neuron communication.Therefore, the correct option is D: a synapse

During the transmission of nerve impulse through a nerve fibre, the potential on the inner side of the plasma membrane has which type of electric charge?

aFirst positive, then negative and continue to be negative.

bFirst negative, then positive and continue to be positive.

cFirst positive, then negative and again back to positive.

dFirst negative, then positive and again back to negative.

✓ Correct answer: d) First negative, then positive and again back to negative.

ExplanationResting State: The inner side of the plasma membrane is negative relative to the outer side due to the resting membrane potential (~70 mV).This is maintained by the sodium-potassium pump and selective permeability of the membrane.Depolarization: When a stimulus is applied, Na⁺ channels open, and Na⁺ ions rush into the neuron.This causes the inner membrane to become positive (action potential).Repolarization: After depolarization, K⁺ channels open, allowing K⁺ ions to move out of the cell.This restores the negative charge on the inner side of the membrane.Restoration: The resting potential is re-established by the sodium-potassium pump, keeping the inside of the membrane negative.

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