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- A cardiologist observed an cntargc4 QRS wave in the ECU of a patient. What does it indicate?Nervi vasorum control ________.a. vasoconstrictionb. vasodilationc. capillary permeabilityd. both vasoconstriction and vasodilationon an EKG strip, a nurse determines that a patient's heart is beating 5 times every 4 seconds. Calculate the time for each heart beat in seconds: Calculate the patient's heart rate in beats/min: (Hint: Divide 60 by the time per beat)
- Which portion of the ECG corresponds torepolarization of the atria?a. P waveb. QRS complexc. T waved. none of the above: atrial repolarization is maskedby ventricular depolarizationDrugs that increase the heart rate have __________a effect.a. myogenicb. negative inotropicc. positive inotropicd. negative chronotropice. positive chronotropic1. In ventricular fibrillation, there is no pattern visible in the EKG. What does this mean in terms of contraction? A. contraction will have no visible pattern either and the ventricles will be unable to eject much blood B. the pattern doesn't matter; contraction of the ventricles will not be affected as long as ventricular myocytes continue to depolarize and depolarize C. the ventricular myocytes will be unable to contract C. contraction will become constant and ventricles will be unable to fill with blood 2. Which structure follows depolarization of the SA Node and atria in the cardiac conduction system? A.ventricular myocytes B.AV Node C.left and right bundle branches D.AV bundle E Purkinje fibers 3. Hypertension increases afterload for the heart which in turn A. increases Stroke Volume B. decreases Stroke Volume C.increases Cardiac Output D.increases Venous Return
- On an electrocardiogram (EKG), the electrical resetting of the ventricles is a. shown by the P wave b. hidden by the ORS complex c. shown by the T wave d. hidden by the P wave e. shown by the QRS complexAn electrocardiogram (ECG) measures the ____. A difference in electrical potential between two points on the body B force produced by the ventricles as they contract C cardiac output D amount of blood the ventricles eject in a single beat E membrane potential at which voltage-gated channels will openWith endurance athletes, an increased stroke volume at rest will occur because of Select 3 correct answer(s) Increased blood volume Increased myocardial contractility Increased compliance of the left ventricle Increased vagal tone
- The nurse caring for a patient who is receiving beta1 agonist drug therapy needs to be aware that these drugs cause which effect?a )Increased cardiac contractilityb) Decreased heart ratec )Bronchoconstrictiond )Increased GI tract motilityWhich of these conditions results the unstable resting membrane potential seen in pacemaker cells? A Na+ ions move into the cell through specialized Na+ ion channels. B Membrane permeability to K+ ions increases. C Voltage-gated Ca2+ ion channels close. D All of these are correct.In a healthy heart during exercise, cardiac output increases as heart rate increases up to about 120bpm, as stroke volume remains constant (CO = HR x SV). As heart rate goes further up, the cardiac output remains stable, and above 160bm it decreases. Why does it decrease? A. shorter filling time decreases stroke volume B. venous return decreases C. valves cannot open and close fast enough D. contractile power of heart muscle cells increases
