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BiologyApril17th2007 - pass through gaps between the...

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Dustin Lee 30.1: Q1-3 Block C: Biology 1. The three primary components of the circulatory system are the blood, the heart, and the blood vessels. Blood is a type of connective tissue made up of cells and liquid. Blood is pumped through the body by the heart, a multi-chambered, muscular organ. The overall flow of blood is from the heart to tissues throughout the body and back to the heart. Capillaries are used to distribute nutrients and oxygen effectively, because the circulatory system must have close contact with all the cells in the body. Arteries are thick-walled blood vessels that bring blood back to the heart. The walls of arteries consist of epithelial tissue wrapped in layers of smooth muscle. Veins are what carry blood returns from the capillaries to the heart. 2. Some small molecules, such as oxygen and carbon dioxide, diffuse across membranes or
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Unformatted text preview: pass through gaps between the epithelial cells of the capillary wall. Oxygen and nutrients move from the blood into the interstitial fluid, while carbon dioxide and other small waste products move from the interstitial fluid into the blood. 3. Like the circulatory system, the lymphatic system consists of capillaries and larger vessels. Once inside the lymphatic vessels, this collected fluid is called lymph. Like veins, lymphatic vessels are embedded in muscle tissue, and they have valves that prevent lymph from flowing back toward the capillaries. The combination of muscle contractions squeezing the vessels and the one-way valves helps fluid move through the lymphatic system. Eventually, lymph drains into the circulatory system near the heart, allowing the fluid to be reused....
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