BIO 203 FINAL EXAM LECTURES 20-28 Verified

ZSASZA ____ is contraction and emptying of the chamber of the heart. ______ is the relaxation and filling of the chamber of the heart. - ANSWER systole diastole Where does INITIAL amount of Ca++ used in the contractile cell originate from? Where does the MAJORITY of the Ca++ used in the contractile cell originate from? - ANSWER ECF SR Which ions are necessary for the AUTORHYTHMIC cell action potential? Which ions are necessary for the CONTRACTILE cell action potential? - ANSWER autorhythmic cell: Ca++ and K+ contractile cell: Na+, Ca++, and K+ Describe Boyles Law, as it was explained in class. - ANSWER Pressure and volume are inversely related. Liquid will flow from a ____ pressure area to a ____ pressure area. - ANSWER high low As the atria contracts, what will happen to the atrial pressure? - ANSWER increase in pressure What is the role of the valves between the chambers of the heart? - ANSWER to prevent backflow; to ensure one way movement of blood through the heart Explain what the isovolumetric contraction is. - ANSWER ventricles contract with no corresponding volume change The walls of the ventricle are much thicker and contain more layers of cardiac muscle than the atria.