f 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

Q: Which of the following is unique to cardiac musclecells?a. Only cardiac muscle contains a…

A: The cardiac muscles show the characteristics of both smooth and striated muscles. The cells of…

Q: Which ion movement causes depolarization in the contractile cells of the heart? Ca++ leaving the…

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Q: Nodal (conductile) cells in the heart differ from other myocardiocytes (contractile cells) in that…

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Q: The second heart sound ("dub") results from vibrations generated by the A. closing of the AV valves…

A: A normal heartbeat consists of two sounds- LUB and DUB. These sounds often occur as pairs in a…

Q: An ECG measures a. changes in electrical potential during the cardiac cycle. b. Ca2+…

A: Introduction: ECG or electrocardiogram is a machine that helps analyse the condition of the heart.…

Q: The major baroreceptor(s) used to regulate blood pressure is/are located in… Group of answer…

A: Baroreceptors sense the change in blood pressure and transmit information to the brain so that…

Q: Parasympathetic stimulation of the sinoatrial node ______.   A is necessary; without it the heart…

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Q: Which neurotransmitter/target receptor combinations would you expect to find in these areas of the…

A: Neurotransmitter and target receptor combinations in the areas of the heart are as follows: SA…

Q: For questions #10-20, match each term to its definition. _____ . Vein…

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Q: During surgery, the right vagus nerve was accidently cut. Explain the effect on the heart rate. a.…

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Q: In the figure below on the left, label the P, QRS and T waves. Describe what is happening in the…

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Q: Which of these is an incorrect statement concerning the heartbeat?a. The atria contract at the same…

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Q: 1. The source of the electrical currents that you measured on the skin throughout a normal…

A: Note: According to the given guidelines, we are supposed to answer only one question (1st question).…

Q: Which of the following channels are involved in the action potential in contractile cells of the…

A: An action potential is a sudden, fast, transitory, and propagating shift in the resting membrane…

Q: نقطة واحدة Veins .1 a.Carry blood away from the heart. O b.Connect the smallest arteries to the…

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Q: Action potentials in the ventricular cardiomyocytes differ from those in the SA node in that action…

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Q: The potential depicted in the figure was recorded from the of the heart. D 20 -20 -40 -60 TIME A…

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Q: In humans the wall of the left ventricle is thicker than that of the right ventricle. This…

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Q: 1- The left ventricular wall of the heart is thicker than the right wall in order to…

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Q: An ectopic pacemaker refers to the condition in which _____.   A the rate at which the SA node…

A: An ectopic pacemaker refers to the condition in which the rate at which the SA node cells undergo…

Q: Blood flows through the vessels references in the above image during:

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Q: Which of the following cardiac tissues has the most rapid conduction velocity? A)The AV node. B)…

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Q: During ventricular diastole, pressure in the ventricles falls to ____ mm Hg, while the pressure…

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Q: Which component of the heart conduction systemwould have the slowest rate of firing?a.…

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Q: Nursing When comparing Ist, 2nd and 3rd degree heart block: a. Which has the same contraction rate…

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Q: What occurs during the atrial reflex? a. Atria slow their filling rate. b. There is a decrease in…

A: Answer is d.) an increase in heart rate occurs in response to an increase in blood volume within the…

Q: Heart failure occurs when   a. the cardiac output is 15 liters per minute when you are watching…

A: A heart failure means that the heart muscle doesn't actually  pump as much blood as per  body…

Q: In a normal heartbeat the atria contract ______.   A at exactly the same time as the ventricles   B…

A: Rhythmic pulsation of the heart as a result of an action potential is known as the heartbeat. The…

Q: In a healthy heart during exercise, cardiac output increases as heart rate increases up to about…

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Q: blood flow in the left coronary artery is less during systole than diastole

A:

Q: Even though it is trivial that Beta Blockers might have negative inotropic effect on the heart, but…

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Q: An electrocardiogram (ECG) measures the ____.   A difference in electrical potential between two…

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Q: Extraodinary contraction of the heart or its certain part is called: O a. extrasystole O b.…

A: Answer given below

Q: During the cardiac cycle, when would you expect to hear the second heart sound? O a) After ejection…

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Q: The heart’s internal pacemaker beats by: a. an internal implant that sends an electrical impulse…

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Q: Which of these conditions results the unstable resting membrane potential seen in pacemaker cells?

A: The membrane potential is also termed transmembrane potential or membrane voltage. It is the…

Q: (a) (b) The part of the illustration in the middle (b) shows O Pressure at which you would hear the…

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Q: The amount of force that the ventricles produce in a contraction can be increased through ____.   A…

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Q: Choose ALL that apply to the above image. Ais the Purkinje fiber. O Bis the L Bundle Branch. A helps…

A: The heart is a muscular organ that acts as a pumping machine in higher animals. The human heart…

Q: In a healthy heart, which of the following statements is TRUE? A) Depolarization of the…

A: Answer- Option C. It's description has been mentioned in next step that is as follows-:

Q: Repolarization of the ventricles typically _______.   A begins at the end of the T-wave and…

A: Electrocardiograms also called ECGs or EKGs is a simple diagnostic machine that checks the…