31. The air sacs expand and contract due to changes in the volume in the thorax and abdomen. 32. These dots are the air sacs . 33. The disease, almost always caused by smoking, destroys air sacs in the lungs, leaving patients struggling for breath. 34. To lighten its vertebrae, " Apatosaurus " had air sacs that made the bones internally full of holes. 35. He figured that sound waves would make the air sacs vibrate, but he did not know how much. 36. It somberly detailed how cigarette smoking destroys alveoli, tiny air sacs in the lungs that are critical to breathing. 37. The life-threatening condition emerges when blood and fluid leak into the lungs'tiny air sacs and patients have trouble breathing. 38. Beginning in the 1970s, the effects of sauropod air sacs on their supposed aquatic lifestyle began to be explored. 39. These sounds are reflected by the dense concave bone of the cranium and an air sac at its base. 40. Instead, Sands shoots a native bladder bird and uses its air sac to keep breathing as he gives chase.
