How are involuntary action and reflex action different from each other?

Dear Student

(a) Involuntary action involves autonomic nervous system.
(i) They occur in response to internal stimuli.
(ii) They are connected with functioning of internal body parts.
(iii) It occurs without the will of the organism. E.g., heartbeat, breathing, etc.
(iv) These are regulated by medulla oblongata (hind brain).
(b) Reflex action involves all parts of voluntary nervous system though they are not voluntary.
(i) They operate against harmful stimuli which are generally external.
(ii) They are connected with emergency i.e, response to stimuli.
(iii) Some reflexes involve the brain, rather than the spinal cord.
(iv) Reflex action is generally controlled by spinal cord.

Thanks