Question

guys answer this one ​

Answer 1

A reflex, or reflex action, is an involuntary and nearly instantaneous movement in response to a stimulus. A reflex is made possible by neural pathways called reflex arcs which can act on an impulse before that impulse reaches the brain.

example:

Reflex action is a sudden action in response to something in the environment. e.g., pulling out hand from the flame if accidently touched. The path of the reflex action is as follows : Receptors → sensory neuron → spinal cord → motor neuron → effector .

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Answer 2

Answer:

pupil of the eye

changes Change its size when light acts as a stimulus