The tracheal system is composed of chitin-ringed tubes called tracheae
{"Image DocumentName": "The tracheal system is composed of chitin-ringed tubes called tracheae", "Image ImageDescription": "these connect directly to the air through openings in the body wall called spiracles. The tracheae are reinforced with rings of chitin, the same material that makes up the exoskeleton. Small inactive insects rely solely on diffusion. Bigger active ones may ventilate the tracheae.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}