CBSE Class 10 > Class 10 Videos > Reflex Arc
Reflex Arc Video Lecture - Class 10
FAQs on Reflex Arc
| 1. What is a reflex arc and how does it work in the human nervous system? |  |
Ans. A reflex arc is the pathway that allows the body to respond rapidly to stimuli without involving the brain. It consists of a sensory receptor, sensory neuron, spinal cord, motor neuron, and effector muscle working together. When you touch something hot, the reflex arc sends signals directly through the spinal cord, causing immediate withdrawal before pain signals reach your brain, enabling quick protective responses.
| 2. What are the main components of a reflex arc and what does each part do? | |
Ans. The reflex arc contains five key components: sensory receptors detect stimuli, sensory neurons carry signals to the spinal cord, the spinal cord acts as the processing centre, motor neurons transmit signals to muscles, and effectors (muscles) produce the response. Each component has a specific role-receptors sense danger, neurons transmit information, the spinal cord coordinates the pathway, and muscles execute the rapid action without requiring brain involvement.
| 3. Why is a reflex action faster than a normal voluntary response in CBSE Class 10? | |
Ans. Reflex actions bypass the brain entirely, taking the shortest neural pathway through the spinal cord, making them exceptionally fast. Voluntary responses require signals to travel to the brain for processing and decision-making, which takes significantly longer. Since reflexes involve only three neurons (sensory, relay, and motor) with two synapses, the transmission is almost instantaneous compared to the multiple processing steps in conscious actions.
| 4. What's the difference between a reflex arc and a reflex action? | |
Ans. A reflex arc is the anatomical pathway or neural circuit that enables rapid responses, while a reflex action is the actual physical response that occurs. The reflex arc is the structural route (receptor to spinal cord to muscle), and the reflex action is the visible result (like pulling your hand away from heat). Understanding this distinction helps clarify that the arc is the mechanism, and the action is the outcome.
| 5. How do sensory and motor neurons work together in a reflex arc to create an immediate response? | |
Ans. Sensory neurons detect stimuli and transmit signals to the spinal cord, while motor neurons receive processed signals and carry them to muscles. The synapse between sensory and motor neurons (often with a relay neuron) allows chemical transmission of signals. This coordinated relay system enables rapid muscle contraction without waiting for brain signals, ensuring protective responses happen instantly during dangerous situations like touching a flame.
Text Transcript from Video
reflex action lens reflex arc whenever
we happen to come close to an object
that is capable of harming us we
immediately withdraw the part of the
body that is the most vulnerable this is
called reflex action when a person
touches a hot cup the sensory receptors
in the hand send a stimulus via the
afferent pathway which contains afferent
neurons to the spinal cord the afferent
neurons enter the dorsal nerve root of
the spinal cord the stimulus is passed
on to the efferent neuron which travels
the efferent pathway to reach the
effector organ in this case the muscles
of the arm as a result the hand is
quickly pulled back the brain is not
involved in the reflex actions as it
would take more time for the impulses to
travel to and fro from the brain
the afferent neurons or receptors taking
the causal stimulus to the CNS the
spinal cord the efferent neurons or
effectors the exciter neurons and the
action performed in response to the
stimulus together form the reflex arc
we happen to come close to an object
that is capable of harming us we
immediately withdraw the part of the
body that is the most vulnerable this is
called reflex action when a person
touches a hot cup the sensory receptors
in the hand send a stimulus via the
afferent pathway which contains afferent
neurons to the spinal cord the afferent
neurons enter the dorsal nerve root of
the spinal cord the stimulus is passed
on to the efferent neuron which travels
the efferent pathway to reach the
effector organ in this case the muscles
of the arm as a result the hand is
quickly pulled back the brain is not
involved in the reflex actions as it
would take more time for the impulses to
travel to and fro from the brain
the afferent neurons or receptors taking
the causal stimulus to the CNS the
spinal cord the efferent neurons or
effectors the exciter neurons and the
action performed in response to the
stimulus together form the reflex arc
About this Video
4.9/5 Rating
Apr 20, 2026 Last updated
Related Exams
Reflex Arc for Class 102026 is part of Class 10 preparation. The notes and questions for Reflex Arc have been prepared according to the Class 10 exam syllabus. Information about Reflex Arc covers all important topics for Class 102026 Exam. Find important definitions, questions, notes, meanings, examples, exercises and tests below for Reflex Arc.
Description
Reflex Arc of covers all the important topics, helping you prepare for the Class 10 exam on EduRev. Start for free!
Information about Reflex Arc
Here you can find the Reflex Arc defined & explained in the simplest way possible. Besides explaining types of Reflex Arc theory, EduRev gives you an ample number of questions to practice Reflex Arc tests, examples and also practice Class 10 tests.
Related Searches
Summary, practice quizzes, Exam, Free, Reflex Arc, video lectures, Previous Year Questions with Solutions, Important questions, MCQs, study material, pdf , Semester Notes, Reflex Arc, ppt, past year papers, Extra Questions, Reflex Arc, shortcuts and tricks, Viva Questions, Objective type Questions, Sample Paper, mock tests for examination;