The term 'body parts that blink' refers to the eyes, which are the only body part that blinks. The eyes are the most important sensory organ in the human body, allowing us to see the world around us. They are also the only body part that can blink, which is an important reflex that helps protect the eyes from dust and other particles. Blinking also helps keep the eyes lubricated and moist, which is essential for good vision.