- Reflex actions are involuntary, rapid responses to stimuli mediated by the nervous system, often without conscious thought. Examples include withdrawal from pain or heat, blinking, salivation, knee- jerk reflex. - Salivation is a classic reflex action triggered by stimuli like the sight, smell, or taste of food. - Heart-pumping and breathing are vital physiological processes that are primarily involuntary and regulated by the autonomic nervous system through complex reflexive mechanisms responding to internal cues (like blood pressure or CO2 levels). - "Movement of hand" can refer to a voluntary action (like picking up an object) or an involuntary reflex action (like withdrawing the hand from a hot surface). Since voluntary movement of the hand is possible and common, it is not exclusively a reflex action. Compared to the other options which describe primarily involuntary/reflexively controlled physiological processes, voluntary "Movement of hand" is clearly not a reflex action.