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  Diagram showing conduction of nerve impulse through an axon by movement of sodium and potassium ions. NEET-Level MCQs: Neural Control & Coordination  By- Dr.Sanjaykumar pawar Topic: Impulse Conduction Through Axon (Hard Level) MCQ 1 During depolarisation of an axonal membrane: A. K⁺ ions rapidly enter the axoplasm B. Na⁺ ions rapidly diffuse into the axoplasm C. Cl⁻ ions move outside the membrane D. Na⁺ ions are actively transported outside Answer: ✅ B. Na⁺ ions rapidly diffuse into the axoplasm Explanation: Depolarisation occurs due to opening of voltage-gated Na⁺ channels causing rapid Na⁺ influx. MCQ 2 The resting membrane potential in a neuron is mainly due to: A. Equal permeability to Na⁺ and K⁺ B. Higher permeability to Na⁺ than K⁺ C. Differential distribution of ions across membrane D. Active transport of Cl⁻ ions only Answer: ✅ C. Differential distribution of ions across membrane Explanation: Unequal distribution of Na⁺ and K⁺ ions creates ...

  Transmission of Nerve Impulses — Easy NEET Notes  By - Dr.Sanjaykumar pawar 18.3.2 Transmission of Impulses 1. What is a nerve impulse? A nerve impulse is an electrical signal that travels through a neuron. It helps in communication between different parts of the body. 2. What is a Synapse? A synapse is the junction between two neurons. Through this junction, nerve impulses pass from one neuron to another. Structure of Synapse A synapse is formed by: Pre-synaptic neuron → neuron sending the impulse Post-synaptic neuron → neuron receiving the impulse Synaptic cleft → small gap between the two neurons Types of Synapses A. Electrical Synapse Features Pre- and post-synaptic membranes are very close. Electrical current flows directly from one neuron to another. Impulse transmission is very fast. Important Points Similar to impulse conduction along one axon. Faster than chemical synapse. Rare in humans. NEET Point No neurotransmitter is re...

Structure of Neuron – Easy NEET Notes  - Dr.Sanjaykumar pawar  Neuron Neuron is the structural and functional unit of nervous system . It receives, processes and transmits nerve impulses. Neurons are also called nerve cells . Parts of a Neuron 1. Cell Body (Cyton / Soma) Main part of neuron containing the cytoplasm and nucleus . Controls all activities of the neuron. Contains Nissl’s granules . Nissl’s Granules Granular structures present in cytoplasm. Help in protein synthesis . Present in cell body and dendrites. Absent in axon. 2. Dendrites Short, branched fibres arising from cell body. Receive stimuli or nerve impulses. Carry impulses towards the cell body . Important Point Dendrites contain Nissl’s granules . 3. Axon Long fibre arising from cell body. Conducts nerve impulses away from the cell body . Distal end of axon is branched. Axon Terminal Terminal branches end in swollen bulb-like structures called synaptic knobs . Synapt...