BIO 203 FINAL EXAM LECTURES 20-28 Accurate!!

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. Why do you think that is? - ANSWER Because they need to pump blood with more force What is the maximum volume of blood volume inside the heart called? - ANSWER end diastolic volume What produces the heart sounds? - ANSWER closing off of both valves