Biology teacher

  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 ...

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...