5. You are a synthetic chemist and have created a compound that appears to bind to acetylcholine receptors. When applied to the inside of the right atrium, what will the affect be? A) Increased heart rate B) No effects on heart function C) Increased force of atrial contraction D) Decreased force of atrial contraction E) Decreased heart rate 6. The plateau of the action potential in cardiac ventricular cells results from the opening of voltage-gated long-lasting ________ channels in the plasma membrane of the cell. A) Na+ B) Cl- C) glucose D) Ca2+ E) K+ 7. You are learning to read electrocardiograms. You know that the patient you are examining has a pathology affecting the depolarization of his ventricles, therefore you're looking for a change in what portion of his EKG? A) The T wave B) The P wave C) "The P wave" or "The T wave" but not "The QRS complex". D) The QRS complex E) None of these would be altered 8. In a patient with an abnormally leaky aortic valve, what would you expect? A) Some backflow of blood into the left ventricle during ventricular ejection B) Some backflow of blood into the aorta during ventricular diastole C) Some backflow of blood into the left atrium during ventricular systole D) Some backflow of blood into the left ventricle during ventricular diastole E) Some backflow of blood into the aorta during ventricular ejection
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When the compound that binds to acetylcholine receptors is applied to the inside of the right atrium, it is likely to have an effect on heart function. Acetylcholine is a neurotransmitter that typically slows down heart rate and decreases the force of atrial Show moreā¦
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The refractory period of a contractile cardiac muscle cell takes longer than that of a typical neuron. Question 21: Action potentials in the heart spread from cell to cell through gap junctions. Question 22: The frequency of action potentials generated by the SA node will be increased by sympathetic stimulation. Question 23: The Frank-Starling law of the heart states that stroke volume is proportional to the end-diastolic volume. Question 24: Atrial depolarization causes the P wave. Question 25: A drug hyperpolarizes the pacemaker cells. It probably binds as an agonist to muscarinic receptors. Question 26: The only time during the cardiac cycle that the AV valves are open is ventricular systole. Question 27: Blocking If channels (funny channels) in the heart would treat bradycardia. Question 28: The AV node is important because it slows the transmission of the electrical impulses to the ventricles in order for the atria to finish contracting. Question 29: In a normal ECG, the wave generated by ventricular repolarization is called the T wave.
Adi S.
22) Which of the following represents the accurate sequence of the spread of cardiac excitation? (2 pts) a) Right atrium ā right ventricle ā left atrium ā left ventricle b) Right ventricle ā left atrium ā left ventricle ā right atrium c) SA node ā AV node ā bundle of His ā Purkinje fibers d) SA node ā bundle of His ā AV node ā Purkinje fibers 23) During the P-Q interval, which of the following mechanical events is/are occurring? Choose ALL that apply. (2.5 points) a) Atria contract. b) AV valves close creating the S1 heart sound. c) Blood volume in the ventricles increases. d) Pressure in the atria increases. e) Ventricles depolarize. 24) Match the ECG components to the appropriate description. (4 points) Matching options: ā¢ P wave ā¢ PQ interval ā¢ QRS complex ā¢ ST segment ā¢ T wave ā¢ TP interval a) Which ECG component corresponds to atrial depolarization? b) Which ECG component corresponds to ventricular depolarization? c) Which ECG component represents the time from the beginning of atrial excitation to the beginning of ventricular excitation? d) Which ECG component represents the time when the contractile muscle fibers of the ventricles are completely depolarized? e) What ECG wave comes immediately before ventricular systole? f) If heart rate increased, which ECG component would change the most? g) Which ECG wave comes immediately before atrial contraction? h) Which ECG wave comes immediately before ventricular relaxation?
Madhur L.
19. Which of these is not part of the cardiac conduction system? A. the sinoatrial (SA) node B. the tendinous cords (TC) C. the atrioventricular (AV) node D. the atrioventricular (AV) bundle (bundle of His) E. the Purkinje fibers 20. Pyrogen is a substance that causes A. inflammation. B. opsonization. C. complement fixation. D. cytolysis. E. fever. 21. Lymphatic vessels recover about ______________ of the fluid filtered by capillaries. A. 5% B. 15% C. 25% D. 50% E. 85% 22. Lymph is similar to blood plasma, but very low in A. protein. B. carbon dioxide. C. metabolic waste. D. electrolytes. E. sodium and potassium. 23. All these can lead to edema except A. obstruction of lymphatic vessels. B. liver disease. C. famine. D. hyperproteinemia. E. hypertension. 24. Atrial depolarization causes A. the P wave. B. the QRS complex. C. the T wave. D. the first heart sound. E. the quiescent period. 25. When the left ventricle contracts, the _____ valve closes and the _____ valve is pushed open. A. bicuspid; pulmonary B. tricuspid; pulmonary C. tricuspid; aortic D. mitral; aortic E. aortic; pulmonary 26. Mitral valve stenosis causes blood to leak back into the ___________ when the ventricles contract. A. left atrium B. right atrium C. aorta D. pulmonary trunk E. pulmonary arteries 27. These are the most abundant agranulocytes. A. macrophages B. eosinophils C. monocytes D. lymphocytes E. neutrophils 28. The volume of blood ejected by each ventricle in one minute is called A. the cardiac reserve. B. the preload. C. the afterload. D. the stroke volume. E. the cardiac output.
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