Reflexes are automatic responses of the body to certain stimuli, allowing for quick reactions without conscious thought. For example, when you touch something hot, your body immediately pulls away to prevent injury. This rapid response is crucial for survival and is controlled by the nervous system. There are different types of reflexes, such as stretch reflexes and withdrawal reflexes. Stretch reflexes help maintain posture and balance, while withdrawal reflexes protect the body from harm. These involuntary actions are essential for everyday functioning and are often tested in medical examinations to assess the health of the nervous system.