. Elementary biology; an introduction to the science of life. Biology. AIR AND LIFE 145. Fig. 43. Breathing tubes in insects J, the spiracles in the side of the body, opening into the tracheae t, which branch repeatedly and bring air to all the tissues live cells beneath the bark get their oxygen supply by way of the lenti- cels (see Fig, 24), which open to the exterior and connect with passages that carry air to the cambium, or growing layer. Since the cells of the plant use comparatively small amounts of oxygen, they can get enough from the air that diffuses slowly through these openings and
. Elementary biology; an introduction to the science of life. Biology. AIR AND LIFE 145. Fig. 43. Breathing tubes in insects J, the spiracles in the side of the body, opening into the tracheae t, which branch repeatedly and bring air to all the tissues live cells beneath the bark get their oxygen supply by way of the lenti- cels (see Fig, 24), which open to the exterior and connect with passages that carry air to the cambium, or growing layer. Since the cells of the plant use comparatively small amounts of oxygen, they can get enough from the air that diffuses slowly through these openings and passages. The carbon dioxid given off by cells diffuses to the exterior along the same paths (Fig. 42). In insects, which use relatively large amounts of oxygen, the cells in the interior of the body get their supplies from very delicate tubes that branch into all parts and connect with the outside through little openings arranged along the sides (see Fig. 43). The movements of the body, by compressing and releasing these tubes, aid in the circula- tion. In some insects, as the common locust, there are rhyth- mic movements that alternately empty and fill the air pipes, thus accelerat- ing the diffusion of oxygen and the removal of carbon Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston New York [etc. ] Ginn and company
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