BIOL 1107 Chapter Notes - Chapter 42: Gastrovascular Cavity, Blood Vessel, Hemolymph
Document Summary
Multicellular organisms use respiratory systems for exchange with environment and circulatory systems to exchange materials to rest of body. Circulatory systems link exchange surfaces with cells throughout the body. Gastrovascular cavity: distribution/exchange of substances throughout body/digestion. Fluid bathes inner and outer tissue layers. Ex. jelly aurelia (cnidaria) cavity has canals that lead to/comfrom circular canal. Circulatory system: connects fluid surrounding cells with organs that exchange gases, absorb nutrients and dispose wastes. Three basic components of circulatory system: circulatory fluid, interconnecting vessels, heart: muscular pump. Heart uses metabolic energy for circulatory fluid pressure. Open circulatory system: hemolymph bathes body cells and circulates in open vessels. Closed circulatory system: blood circulates in closed vessels that infiltrate tissues and organs. Cardiovascular system: heart and blood vessels in vertebrates. Three types of blood vessels: arteries, veins, capillaries. Single circulation: blood travels through body and returns to starting point. Double circulation: pumps are combined into heart. Gas exchange: o2 in blood and co2 out.
