BIOL 1202 Study Guide - Final Guide: Reabsorption, Globulin, Respiratory Tract
Document Summary
Concept 42. 1: circulatory systems link exchange surfaces with cells throughout the body. *transport systems functionally connect the organs of exchange with the body cells. Simple animals like cnidarians have a body wall only 2 cell-layers thick between external environment and gastrovascular cavity. Gastrovascular cavity functions both in digestion and circulation. More complex animals have two types of circulatory systems. Open circulatory system: blood bathes the organs directly. Closed circulatory system: blood is confined to vessels and is distinct from the interstitial fluid. 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. Cardiac cycle: rhythmic contraction and relaxation of the heart. Heart cells that regularly produce spontaneous electrical impulses. Impulses spread throughout heart-muscle cells and stimulates them to contract.
