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…

Cardiopulmonary Anatomy & Physiology

7th Edition

ISBN:9781337794909

Author:Des Jardins, Terry.

Publisher:Des Jardins, Terry.

Chapter12: Electrophysiology Of The Heart

Section: Chapter Questions

Problem 9RQ: An electrical difference across the fibers of the heart is called the A. Absolute refractory period...

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Similar questions

A characteristic of blood circulation through or to the heart is that: a. the superior vena cava conveys blood to the head. b. the inferior vena cava conveys blood to the right atrium. c. the pulmonary arteries convey blood from the lungs to theleft atrium. d. the pulmonary veins convey blood into the left ventricle. e. the aorta branches into two coronary arteries that conveyblood from heart muscle.
Which of the following lists the valves in the order through which the blood flows from the vena cava through the heart? tricuspid, pulmonary semilunar, bicuspid, aortic semilunar mitral, pulmonary semilunar, bicuspid, aortic semilunar aortic semilunar, pulmonary semilunar, tricuspid, bicuspid bicuspid, aortic semilunar, tricuspid, pulmonary semilunar
2.A. 1. 2. 3. 4. |||| ential (mv) 13. State the channels involved in an action potential in cardiac AUTORHYTHMIC cells, which ion moves across the channel, which direction each ion moves across the channel when the channel opens, the approximate membrane potential at which the channel is fully open. +20 !!| CE - | Channel AaBbCcDdEe AaBbCcD. AaBBCEDE Aal Emphasis Heading 1 Normal lon? Influx or Efflux? 14. Define the term pacemaker potential (=drifting potential) and be able to identify it when given a graph of an action potential in an autorhythmic cell such as the one below. I Membrane Potential at which channel opens or is fully open (mv)
• Myocardium O C. Endocardium O d. All the above O e None of the above QUESTION 4 In the presence of ventricular septal defects, a left-to-right cardiac shunt indicates that: O a. Blood from the right ventricle enters the left ventricle b. Blood from the left ventricle enters the right ventricle Oc. Blood from the left ventricle enters the left atrium O d. Blood continues to flow normally O e. Blood stops flowing QUESTION 5 Click Save and Submit to save and submit. Click Save All Answers to save all answers.
29. Absent "P" waves in a junctional arrhythmia indicate: A. Retrograde atrial deplorization occurs at the same time as antegrade ventricular depolarization B. Atrial depolarization has not occurred because a retrograde AV block OC. Either of the abde O D. None of the above
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:
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
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.
6. Put the following events of the conduction system in the proper order (#1-9). 1 sinoatrial node atrioventricular node right and left bundle branches contraction of atria ventricular depolarization atrioventricular bundle Purkinje fibers 9. contraction of ventricles depolarization of atria 7. Label the waves (P, QRS, T) and intervals (P-Q, S-T, Q-T) on the following ECG. 8. Match the portion of the ECG with the description. P wave A. This segment is elevated in acute myocardial infarction (heart attack). QRS complex B. Beginning of atrial excitation to beginning of ventricular excitation. T wave C. Ventricular depolarization P-Q interval D. Atrial depolarization S-T segment E. Ventricular repolarization F. Beginning of ventricular depolarization to end of ventricular repolarization. Q-T interval
An ectopic pacemaker refers to the condition in which _____. A the rate at which the SA node cells undergo spontaneous depolarization is abnormal B "all of the heart cells function independently of one another such that the heart vibrates, but fails to pump blood" C action potentials in the heart are initiated by a region other than the sinoatrial node D the endothelial cells

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