8. Even though it is trivial that Beta Blockers might have negative inotropic effect on theheart, but they improve the overall heart function in heart failure at the end and used forthis condition, because:a. They decrease reflex overload of the heartb. They inhibit RAAS systemc. They decrease after loadd. They slow electrical conduction of SA and AV nodes which increases the filling timeof the ventricles which improves extraction fraction in HFFEFe. All of the above

Beta-blockers act on the Beta 1 receptors which are located in the heart and it slows down the…

Answered: Even though it is trivial that Beta…

Phlebotomy Essentials

6th Edition

ISBN:9781451194524

Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Chapter1: Phlebotomy: Past And Present And The Healthcare Setting

Section: Chapter Questions

Problem 1SRQ

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Only one is correct Contraction of cardiac muscle is initiated during which phase of the fast action potential? What ion mediates this effect? A. Phase 0 due to Ca++ entry B. Phase 1 due to Na+ entry and K+ exit C. Phase 2 due to Ca++ entry D. Phase 4 due to K+ exit Group of answer choices Phase 2 due to Ca++ entry Phase 1 due to Na+ entry and K+ exit Phase 0 due to Ca++ entry Phase 4 due to K+ exit
8. In a standard ECG, what do the following represent: а. Р- b. QRS= C. T= d. U= e. The # of QRS complexes in a time period:
49 Which of the following can cause bradycardia? Select all that apply. a. Increased sympathetic nervous system stimulation b. Hyperkalemia 000000000000 c. Carotid sinus massage d. Beta blockers e. Digitalis
Affects on the cardiovascular system in patients with Addison’s disease include all, except:A. CardiomegalyB. HypotensionC. BradycardiaD. Decreasing ECG voltageE. Reduction in the dimensions of heart
17. Match the ECG wave information with the appropriate action potential in the following columns: a.P wave e.Depolarization of the AV node b.QRS complex f.Repolarization of ventricles c.PR segment g.Depolarization of ventricles d.T wave h.Depolarization of the atria Match the itmes in the left columns to the right columns.
If the sinoatrial node stopped generating action potentials the heart would _____. A stop beating because the sinoatrial node is the heart's pacemaker B beat with a slower frequency due to the spontaneous depolarization of the AV node C go into fibrillation immediately because the heart cells would no longer function in a coordinated rhythm D continue to beat normally because the sympathetic neurons going to the cardiomyocytes would initiate the depolarization
Which of the following is not true about Ventricular cardiac action potentials? O A. Action potentials arise from current flow across membranes. B. Current is carried by neutral ions. O C. Action potentials fire in an all-or-none fashion. OD. A stimulus usually initiates the action potential in healthy cells. O E. Potassium is the dominant current during the diastolic interval. HELENT
V09
22. Ventricular Contractility increases in response to circulating Epinephrine. What factor is responsible for this increase in the force of the contraction? A.the Na+ current (depol.) B.the Ca++ current which causes the plateau (trigger Ca++) C.the K+ current D.a decreased Central Venous Pressure 23. Normally, Systole takes up about 80% of the Cardiac Cycle. A. true B. false 24.Which of the following is not an affect of circulating Angiostensin II (AII)? A.thirst B.selective vasodilation C.increased peripheral vascular tone & resistance D.the release of Aldosterone from the adrenal cortex 25. Blood Volume affects blood pressure because it directly increases: A.Total Peripheral Resistance B.Stroke Volume C.End Systolic Volume D.Central Venous Pressure 26. Atrial Naturetic Factor is released to adjust blood pressure. Which organ releases this hormone? A.the heart B.the kidneys C.the adrenal cortex

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