Neural Control and Coordination — Class 11 Biology NCERT Solutions (Free)
Free step-by-step NCERT solutions for Class 11 Biology chapter "Neural Control and Coordination" — 8 important questions with detailed answers for CBSE board exam preparation.
TL;DR: Free step-by-step NCERT solutions for Class 11 Biology chapter "Neural Control and Coordination" — 8 important questions with detailed answers for CBS…
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Key Questions Covered:
- What is a neuron? Name its three main parts and their functions.
- Differentiate between myelinated and unmyelinated nerve fibers.
- Explain the all-or-none principle in nerve impulse transmission.
- + 5 more questions in the full chapter
Solutions Summary:
| Question | Status |
|---|---|
| What is a neuron? Name its three main parts and their fun… | ✓ Solved |
| Differentiate between myelinated and unmyelinated nerve f… | ✓ Solved |
| Explain the all-or-none principle in nerve impulse transm… | ✓ Solved |
Showing 3 of 8 questions
Q1: What is a neuron? Name its three main parts and their functions.
Neuron is the structural and functional unit of nervous system.
Three main parts:
- Dendrite: receives signals from other neurons via neurotransmitters; increases surface area
- Cell body (soma): contains nucleus; site of protein synthesis
- Axon: transmits electrical signals away from cell body; en...
Q2: Differentiate between myelinated and unmyelinated nerve fibers.
Myelinated fibers:
- Covered by myelin sheath formed by Schwann cells; segmented
- Saltatory conduction (jump along nodes of Ranvier)
- Conduction velocity: 100+ m/s
- Found in somatic and autonomic nervous systems
Unmyelinated fibers:
- No myelin sheath; multiple axons embedded in single Schwann ce...
Q3: Explain the all-or-none principle in nerve impulse transmission.
All-or-none principle:
- If stimulus intensity reaches threshold, action potential fires completely
- If stimulus is below threshold, no action potential occurs
- Once threshold is reached, further stimulus increase does not alter magnitude of action potential
- Intensity of stimulus is conveyed by ...
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