BY 108 Chapter Notes - Chapter 24: Superior Vena Cava, Sinus Venosus, Tricuspid Valve
Document Summary
Fish heart - replaced simple tubular hearts tube w/ 4 chambers. Atrium/sinus venosus - 1st 2 chambers, for collection. Ventricle/conus arteriosus - last 2 chambers, for pumping. Order of contraction - sinus venosus >> atrium >> ventricle >> conus arteriosus. Blood passes through gills after going through heart >> much of pressure from pumping lost amphibian/reptile heart - has 2 separate circulations due to lungs inread invented by teads. Pulmonary circulation - between heart and lungs. Systemic circulation - between heart, rest of body. Separated atriums prevent oxygenated/deoxygenated blood from mixing. Aorta - major artery of systemic circulation. Cutaneous respiration - breathing through the skin mammalian/bird hearts - 4 chambered heart w/ separate atria/ventricles. Right atrium receives deoxygenated blood >> right ventricle pumps blood to lungs left atrium receives oxygenated blood >> left ventricle pumps blood to body. Double circulation - atrium/ventricles contract at same time. Both ventricles must pump same amount of blood.
