Reflexes are automatic responses that protect the body and enhance survival without conscious thought. The nervous system processes sensory input rapidly, sending signals to muscles before the brain fully registers the event. The knee-jerk reflex, controlled by the spinal cord, helps maintain balance and posture. Blink reflexes protect the eyes from sudden threats, while the withdrawal reflex pulls the body away from pain. Some reflexes, like the startle response, are evolutionary mechanisms ...
