Nursing When comparing Ist, 2nd and 3rd degree heart block: a. Which has the same contraction rate in the ventricles as in the atria? b. Which has (have) a slower ventricular rate than atrial rate? C. Which has a very slow but regular ventricular beat? d. In 3rd degree heart block, where is the atrial rate set? Where is the ventriclar rate set ?

Nursing When comparing Ist, 2nd and 3rd degree heart block: a. Which has the same contraction rate in the ventricles as in the atria? b. Which has (have) a slower ventricular rate than atrial rate? C. Which has a very slow but regular ventricular beat? d. In 3rd degree heart block, where is the atrial rate set? Where is the ventriclar rate set ?

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter9: Cardiac Physiology

Section: Chapter Questions

Problem 12RE

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Similar questions

The heartbeat includes: a. the systole when the heart relaxes and fills. b. the diastole when the heart contracts and empties. c. pressure that causes the AV valves to open, filling the ventricles. d. rising pressure in the ventricles to open the AV valves and close the SL valves. e. the lub sound when the SL valves open and the dub sound when the AV valves close.
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
. Answer the following questions regarding the cardiac cycle. a. If your heart rate is 50bpm, how long is a single cardiac cycle? sec. b. For the AV valves to open, pressure in the ventricles must be than the pressure in the atria. c. For the aortic SL valve to open, pressure in the left ventricle must be than the pressure in the aorta. d. During atrial systole, the pressure in the ventricle is than the pressure in the atrium. e. For the AV valves to close, pressure in the ventricle must be than the pressure in the atria. f. For the aortic SL vale to close, pressure in the aorta must be than the pressure in the left ventricle.
Afterload is Select one: a. the amount cardiac output must increase during exercise. b. the arterial pressure that the ventricles must overcome to eject blood. c. the extent to which ventricular walls are stretched. d. the name given to an increase in end-diastolic volume. e. another name for venous return.
In a healthy young adult, what happens to cardiacoutput when heart rate increases above 160 bpm?a. It increases.b. It decreases.c. It remains constant.d. There is no way to predict
In the measurement of cardiac function; all of the following are true except A. Cardiac output is a measure of the amount of blood pumped by each ventricle in 1 minute B. The heart rate is the number of contractions of the ventricles each minute. C. The stroke volume is the amount of blood ejected from each ventricle with each contraction D. The cardiac output will exceed 5 liters with an increase in HR in all cases Choose the correct answer
Why is it necessary to stimulate papillary muscles in the ventricle slightly earlier than the rest of the ventricular wall myocardium? a. to assure rapid conduction speed of the action potential b. to pull on AV valve cusps to prevent backflow c. to assure blood will surge toward the semilunar valves d. to assure coordinated contraction of the ventricular myocardium
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
In resting state: For a heart that would have a left ventricle of 130 mL of end diastolic volume (EDV) and 60 mL of end systolic volume (ESV) and a heart rate 60 bpm. A. Calculate the output your pump should provide to the aortic arch. (in units of L/min) B. In moderate activity state: If the heart rate is expected to increase by 15% Calculate the output your pump should provide to the aortic arch hibernation levels so they can go back to sleep. A mitochondria-rich tissue called "brown fat" is responsible for this heat-generation.
SA node is the main pacemaker of the heart. Why is the normal heart rate lower than the intrinsic firing rate of the SA node? A. sympathetic inputs from the hypothalamus are slowing it down B. parasympathetic inputs from medulla oblongata are slowing it down C. there is inertia in heart muscle as it takes time for impulse to spread through all the cells D. centrifugal inputs from the AV node are slowing it down
During isovolumetric relaxation, the atrioventricular and semilunar valves are: a. open and ventricular pressure is increasing. b. closed, and ventricular pressure is decreasing, c. closed and ventricular pressure is increasing. O d. closed and ventricular pressure is decrea ing. O e. open and ventricular pressure is decreasing.
The period of ejection: A. begins with closure of the AV-valves and ends with opening of the AV- valves B. begins with opening of the aortic valve and ends with closure of the aortic valve C. begins with the P-wave and ends with the QRS-complex D. begins with the QRS-complex and ends with the T-wave