NURS 223 Test 1 (Already passed!!!)

Ventilation correct answers the movement of air in and out of the lungs Diffusion correct answers movement of gases between air spaces and the bloodstream Respiration correct answers process of the exchange of oxygen and carbon dioxide during cellular metabolism Perfusion correct answers movement of blood in and out of the lungs to the organs and tissues of the body Systole correct answers contraction phase of the heart; blood moves from the ventricles out into systemic circulation Diastole correct answers relaxation phase; blood fills the ventricles Afterload correct answers the resistance of the ejection of blood from the left ventricle Preload correct answers the amount of blood in the ventricles at the end of ventricular diastole Stroke volume correct answers amount of blood ejected from the ventricle with each contraction. 50-75 ml of blood per contraction. Cardiac output correct answers amount of blood ejected from the left ventricle per minute. 4-6 L per minute. SV*HR Myocardial contractility correct answers ability of the heart to squeeze blood from the ventricles and prepare for the next contraction. Sinoatrial node correct answers also called pacemaker, primary area where impulse comes from. Should have a HR of 60-100 bpm. Atrioventricular node correct answers located in the floor of the right atrium Bundle of his correct answers split into right and left bundle branch Purkinje fibers correct answers end of stimulus P wave correct answers atrial depolarization (contract) QRS complex correct answers ventricular depolarization (contract) T wave correct answers ventricular repolarization; ventricular relaxation Decreased cardiac output correct answers failure of the myocardium to eject sufficient blood volume to the systemic and pulmonary circulations