trachea is anatomical structure that is part of both the digestive and respiratory systems.
anatomical structure that is part of both the digestive and respiratory systems?
trachea
there is a wide body-cavity, which has no connection with the renal or reproductive organs, so it is not a coelom; it is probably a blood-space or hemocoel. there are no vascular or respiratory systems, but the body cavity does contain phagocytic amoebocytes and cells containing the respiratory pigment haemerythrin.





























the alimentary canal is straight, consisting of an eversible pharynx, an intestine, and a short rectum. the pharynx is muscular and lined by teeth. the anus is terminal, although in "priapulus" one or two hollow ventral diverticula of the body-wall stretch out behind it.
priapulida
other animals, such as insects, have respiratory systems with very simple anatomical features, and in amphibians even the skin plays a vital role in gas exchange. plants also have respiratory systems but the directionality of gas exchange can be opposite to that in animals. the respiratory system in plants includes anatomical features such as stomata, that are found in various parts of the plant.





























section::::mammals.





























section::::mammals.:anatomy.
respiratory system