Science
Reflex action
प्रतिवर्ती क्रिया
In Class 10 Science, the topic Reflex Action explains how the body responds rapidly and automatically to a stimulus, often before the brain can process it fully. Students learn the pathway of a reflex arc: receptors detect a change, sensory neurons carry the impulse to the spinal cord, relay neurons connect it to motor neurons, and effectors such as muscles produce the response. Examples like quickly withdrawing a hand from a hot object show how this protective mechanism works, while the brain later receives information about the action.
Practice questions
Which option gives the most complete sequence of a reflex arc?MediumLevel 17If skin receptors are active but the message is not reaching the spinal cord, which part of the reflex arc is most likely affected?MediumLevel 18In a reflex action, the hand moves away first and pain is felt later. What is the most suitable reason?MediumLevel 18In which situation is endocrine control more suitable than nervous control?MediumLevel 18If an effector muscle is normal but receives no response message, why will it not respond?MediumLevel 18