Question

Encircle the correct word in the parenthesis about ECG.

Changing from supine to seated position and during inhalation increases heart rate, which is seen as a/n (increase/decrease) in the time interval between adjacent R-waves in the ECG. This is a result of (increase/decrease) in venous return which in turn will (increase/decrease) cardiac output and (increase/decrease) arterial blood pressure. This change in arterial BP will be sensed by baroreceptors. Baroreceptors will (increase/decrease) its firing rate to the medulla oblongata. The medulla oblongata will then (inhibit/stimulate) the SA nose which results in an (increase/decrease) in heart rate. This is a (sympathetic/parasympahthetic) effect to the heart.