BIOL 1202 : Test 5
Document Summary
Exam 5 for final material 42, 43, 44, 46. 42. 1 circulatory systems link exchange surfaces with cells throughout the body: transport systems functionally connect the organs of exchange with the body cells, gastrovascular cavities. Simple animals like cnidarians have a body wall only 2 cell layers thick between external environment and gastrovascular cavity. The cavity function both in digestion and circulation: more complex animals have two types of circulatory systems, circulatory system parts. Open circulatory system: blood bathes the organs directly; arthropods and most mollusks except cephalopods. Closed circulatory system: blood is confined to vessels and is distinct from the interstitial fluid; some invertebrates and all vertebrates. 42. 2 coordinated cycles of heart contraction drive double circulation in mammals: the mammalian cardiovascular system. Heart cells that regularly produce spontaneous electrical impulses. Rhythmic contraction and relaxation of the heart. Diastole: relaxation or filling phase: electrical impulses coordinate the cardiac cycle.
