BIOL 1202 : Biology 1202 Final Exam
Document Summary
Concept 42. 1: circulatory system 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 & gastrovascular cavity, gastrovascular cavity functions as both circulatory and digestion. Circulatory system parts: both of these types of systems have three basic components, a circulatory fluid (blood, a set of tubes (blood vessels, a muscular pump (the heart) A: allows blood and interstitial fluid to mix with each other. Concept 42. 2: coordinated cycles of heart contraction drive double circulation in mammals. The cardiac cycle: cardiac cycle: rhythmic contraction and relaxation of the heart, systole: contraction or pumping phase, diastole: relaxation, or filling, phase. Electrical impulses coordinate the cardiac cycle: pacemaker cells, heart cells that regularly produce spontaneous electrical impulses, impulses spread throughout heart-muscle cells and stimulates them to contract.
