Question

What is reflex action,describe its types and mechanism

Answer 1

✔️✔️Reflex Action is defined as :-

⏹an unconscious, automatic and involuntary response of any threats.

i.e., muscles and glands, to a stimulus, which is monitored through the spinal cord.

⭕️Spinal reflexes-regulated by spinal cord. Ex-moving our hand back after touching the hot plate.

⭕️Cranial reflexes-regulated by brain.
Ex-change in size of pupil

⭕️Similarity-both our sudden automatic responses.

✔️✔️Mechanism of Reflex Action: 

➖It involves :

⭕️Receptor organ like skin perceives the stimulus and activates a sensory nerve impulse.

⭕️Sensory organ carries message in the form of sensory impulse to the spinal cord.

⭕️The spinal cord acts as modulator.

⭕️The neurons of spinal cord transmit the sensory nerve impulse to motor neuron.

⭕️Motor nerve conducts these impulses to the effectors like leg muscles which responds by pulling back the organ away from the harmful stimulus.