BIO 203 Lecture Notes - Lecture 22: Tracheal Tube, Gas Exchange, Abdominal Cavity
1 Dec 2016
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The transport of materials in animals (multicellular processes) Hemolymph as transport fluid: composed of water, salts, organic carbohydrates, proteins and lipids: some organisms have cells called hemocytes, some have hemocyanin to carry oxygen, few have hemoglobin to store oxygen. Transport fluid is not confined exclusively to blood vessels hemocoel. Overall pressure in the system is low good for sedentary organisms with low oxygen demands. How does an open circulatory system meet the metabolic demands of arthropods: the evolution of a (cid:494)tube heart(cid:495) Heart is made up of a number of linearly arranged chambers. Allow a large amount of blood to flow into and out of the surrounding sinus! Both coelomic fluid and blood carry food, wastes and respiratory gases. Blood circulates in a closed system with five main trunks running lengthwise in the body. The dorsal vessel above the alimentary canal has valves and functions as a true heart.
