What best describes reflexes?

Reflexes are best described as involuntary and often self-protective movements. This characteristic highlights the automatic nature of reflex responses, which occur without the need for conscious thought or intention. For instance, the withdrawal reflex when touching something hot happens rapidly and automatically to protect the body from harm.

Reflex actions are mediated by the nervous system and are designed to respond to certain stimuli in a rapid manner. This involuntary aspect means that the body can react quickly to potential dangers, facilitating immediate protective measures. In contrast, other options describe actions that involve conscious decision-making or control, which do not apply to reflexes.