1 SEM CARDLESS ACC W/RAVEN TEXT
12th Edition
ISBN: 9781265321062
Author: Raven
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
Chapter 48, Problem 1U
An ECG measures
a. changes in electrical potential during the cardiac cycle.
b. Ca2+ concentration of the ventricles in diastole.
c. the force of contraction of the atria during systole.
d. the volume of blood being pumped during the contraction cycle.
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An ECG measures
a. changes in electrical potential during the cardiac cycle.
b. Ca2+ concentration of the ventricles in diastole.
c. the force of contraction of the atria during systole.
d. the volume of blood being pumped during the contraction cycle.
The QRS wave of an ECG (or EKG) represents:
a. depolarization of the ventricles.
b. Depolarization and repolarization of the ventricles.
c. Depolarization of the atria and ventricles.
d. depolarization of the atria.
Within the T-P interval of the EKG...
a. The 2nd heart sound is heard
b. the semilunar valves are open
c. Ventricular pressure is higher than atrial pressure
d. Ventricular cardiomyocytes are relaxed
e. L-type calcium current is dominant in the ventricular cardiomyocytes
Chapter 48 Solutions
1 SEM CARDLESS ACC W/RAVEN TEXT
Ch. 48.1 - Prob. 1LOCh. 48.1 - Prob. 2LOCh. 48.2 - Prob. 1LOCh. 48.2 - Prob. 2LOCh. 48.2 - Prob. 3LOCh. 48.3 - Prob. 1LOCh. 48.3 - Prob. 2LOCh. 48.4 - Prob. 1LOCh. 48.4 - Prob. 2LOCh. 48.5 - Prob. 1LO
Ch. 48.5 - Prob. 2LOCh. 48.5 - Prob. 3LOCh. 48.5 - Prob. 4LOCh. 48 - Prob. 1DACh. 48 - Prob. 1IQCh. 48 - Prob. 2IQCh. 48 - An ECG measures a. changes in electrical potential...Ch. 48 - Systole is vitally important to heart function and...Ch. 48 - Which of the following is the correct sequence of...Ch. 48 - Which of the following statements is not true? a....Ch. 48 - Prob. 5UCh. 48 - Prob. 6UCh. 48 - When a sphygmomanometer is used, a. blood pulses...Ch. 48 - Prob. 8UCh. 48 - In vertebrate hearts, atria contract from the top,...Ch. 48 - Prob. 2ACh. 48 - The difference between the amphibian and mammal...Ch. 48 - Prob. 4ACh. 48 - Humans have a number of mechanisms that help to...Ch. 48 - Prob. 2SCh. 48 - Is the evolution of the four-chambered heart...Ch. 48 - Prob. 4S
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- On an ECG, if every other P wave (e.g., every even is, and every odd is not) is NOT followed by the QRS complex, this is: A. first degree AV block B. second degree AV block C. third degree AV block D. atrial fibrillationarrow_forwardBlood flow in the coronary circulationa. increases during systole.b.increases during diastole.c.remains constant throughout the cardiac cycle.d. decreases during diastole.arrow_forwardWhat event(s) occur during the QRS complex of an electrocardiogram? Select one: a. Repolarization of the ventricles b. Depolarization of the atria and repolarization of the ventricles c. Depolarization of the ventricles and repolarization of the atria d. Depolarization of the atriaarrow_forward
- Refer to the figure of the pressures in the cardiac cycle on the right side. Letters indicate time points and numbers indicate 2 different pressures. The pressure indicated by line #1 (in green) is.... A. Atrial pressure B. Pulmonary trunk/artery pressure C. Aortic pressure D. Ventricular pressurearrow_forwardwhich of the following mechanisms contributes most to the deterioration of myocardial perfusion in patients with a progressively dilating left ventricle and a cycle of gradual decompensation. A. decreasing left ventricular radius B. decreasing peripheral vascular resistance C. decreasing vestibular pressure D. increasing left ventricular wall tension E. increasing left ventricular wall thicknessarrow_forwardThe period between the filling of the ventricles and the opening of the semilunar valves in the cardiac cycle is called: A. Atrial Systole B. Isovolumetirc ventricular contraction C. Isovolumetric ventricular relaxation D. Passive ventricular fillingarrow_forward
- Which of the following is/are true concerning the opening and closing of the cardiac valves? A. valves operate according to the pressures on either side of the valve B. valve operation is constantly being controlled by the medulla oblongata C. valve operation is determined directly by the cardiac action potential (electrical currents control the opening and closing of the valves.) D. valve operation is directly controlled by the papillary muscles within the ventricular wall. E. None of the above is correct.arrow_forwardRight and Left Ventricular pressures differ during: A. the entire cardiac cycle B. diastole C. systole D. the period of filling E. None of the above is correct.arrow_forwardDuring which phase of the cardiac cycle are the semilunar valves open? Select one: a.atrial filling b.atrial systole c.ventricular systole d.open in 2 out of 3 phases e.ventricular fillingarrow_forward
- a. Only between cardiac cycles b. Ventricular diastole c. Ventricular systole d. Throughout the cardiac cyclearrow_forwardThe cardiac cycle consists of a distinct relaxation andcontraction phase. Which term is typically used to referventricular contraction while no blood is being ejected?a. systoleb. diastolec. quiescentd. isovolumic contractionarrow_forwardThe AV node delay: a. allows the atria and ventricles to depolarize and contract as a unit. b. allows the two ventricles to depolarize and contract separately. c. allows the atria and ventricles to depolarize and contract separately. d. speeds up the impulse transmission from the atria to the ventriclesarrow_forward
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