A PR interval of less than 0.12 seconds indicates that the pacemaker site of the P wave is in the: A.  AV junction B.  Lower right atrium near AV node C.  Upper right atrium with an accessory AV pathway present WPW D.  All of the above

Q: Which of the following is correct regarding the flow of blood in reference to the left side of the…

A: Heart is the main pumping organ of the body. It is divided into four chambers two upper Chambers are…

Q: During diastole: A. the AV-valves are open and the aortic & pulmonary arterial valves are closed. B.…

A: Systole and diastole are part of cardiac cycle. Systole means contraction of heart and diastole…

Q: Absent "P" waves in a junctional arrhythmia indicate: O A. Retrograde atrial deplorization occurs at…

A: In a normal sinus rhythm the electrical impulse startsin the sinoatrial node. which formulates P…

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: The AV node delay: a. allows the atria and ventricles to depolarize and contract as a unit. b.…

A: The human heart consists of the left and right atria and the left and right ventricles. The heart…

Q: Within the T-P interval of the EKG... a. The 2nd heart sound is heard b. the semilunar valves are…

A: a. The 2nd heart sound is heard

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: Leaky Na+ channels in the cells of the SA Node do which of the following?   a-allow a slow…

A: d-allow a slow depolarization that eventually reaches the threshold for voltage-gated Ca2+ channels.

Q: Refer to the figure of the pressures in the cardiac cycle on the right side. Letters indicate time…

A: This Wigger's diagram is used to understand physiology of heart. It explains -  Blood pressure -…

Q: When would an electric shock delivered to the heart (countershock) be the proper treatment protocol?…

A: An electric shock, or defibrillation, is a life-saving procedure often utilized during a critical…

Q: 45. Which of the following is/are true concerning the opening and closing of thecardiac valves?   A.…

A: The valves of the heart maintain undirectional flow of the blood and prevent its regurgitation in…

Q: А In the image above, the dotted line represents a normal pacemaker potential. Describe the steps…

A: The heart is a major muscular organ of the cardiovascular system that is responsible for pumping the…

Q: What event(s) occur during the QRS complex of an electrocardiogram? Select one: a. Repolarization…

A: The objective of the question is to identify the correct events that occur during the QRS complex of…

Q: A. the fact that one represents a depolarization and the other represents a hyperpolarization. B.…

A: The figure is depicting a voltage-time graph. The red line is observed voltage and dashed line is…

Q: Which of the following conditions might result in the back flow of blood through a weakened mitral…

A: a. High pressure in the left ventricle, low pressure in the left atrium

Q: Which of the following sequences for the conducting system is correct? Select one: a. AV node, SA…

A: The objective of the question is to identify the correct sequence of the conducting system of the…

Q: All of the following are true of cardiac arrest except A. It is the cessation of all heart activity…

A: The heart is a muscular organ that pumps oxygenated blood to the aorta, which conveys it to the…

Q: A. What could be the implicatiosn for the atrial and ventricular contraction-relaxation? B. Draw…

A: If the pacemaker activity in the atrioventricular (AV) node overtakes the sinus node (SA node)…

Q: пишпипшити A. Agonal rhythm/asystole B. Atrial fibrillation C. Atrial flutter D. Monomorphic…

A: The electrical activity pattern that regulates the heart's contractions is referred to as cardiac…

Q: Which of the following is true about the pacemaker potential in the heart? a. Decreased K+ efflux…

A: The pacemaker potential, also known as the prepotential, is the slow, positive increase in voltage…

Q: Indicate the corect statement:

A: The right coronary artery is the first branch of the ascending aorta just beyond the aortic…

Q: 15) The followings are the ECG characteristics of atrial fibrillation,except for() A Disappearance…

A: Atrial fibrillation is the condition when atrial contraction more than 350beat/ minute

Q: 24 25 26 27 28 29 30 31 32 33 Figure 10.2. Heart, Internal 34 35 Figure 10.2 36 A. Aortic valve B.…

A: Heart is chief organ of circulatory system which consists of 4 chamber . These chambers are :-  A )…

Q: The maximum amount of blood within the left ventricle just before the start of isovolumic…

A: The circulatory framework, likewise called the cardiovascular framework or the vascular framework,…

Q: All of the following occur when the ventricles contract except a. the AV valves close. b. blood is…

A: The heart is a muscular organ. Its major function is to pump the blood via the blood vessels of the…

Q: 17, The P-wave of the ECG is generated by the repolarization of the SA-Node.   A. trueB. false

A: The main function of the SA node is to act as the normal pacemaker of the heart. It initiates an…

Q: Which of the following is true regarding the conduction of electrical activity in the heart? Choose…

A: The objective of the question is to identify the correct statement about the conduction of…

Q: Choose the pathology, where is observed shortening of PQ interval in ECG, increasing of cardiac…

A: ECG is the electrocardiogram . It is used to check the heart rhythm and electrical activity. It is a…

Q: The QRS wave of an ECG (or EKG) represents: a. depolarization of the ventricles. b. Depolarization…

A: ECG is basically a graphical representation of the electrical activity which takes place in the…

Q: 1. Identify and color the following in the ECG image below: ● three P waves (color blue) ● ● ● ●…

A: ECG refers to the electrocardiography , it is basically the graphical representation of cardiac…

Q: Which of the following has a correct sequence in cardiac cycle? A. Atrial depolarization →…

A: The cardiac cycle is the performance of the human heart from the beginning of one heartbeat to the…

Q: Identify the TRUE statement (s). There may be several correct answers. A. An increased cardiac…

A: The cardiac cycle refers to all of the events that occur from the start of one heartbeat to the…

Q: An arrhythmia originating in an escape pacemaker in the AV junction with a rate of 40 to 60 beats…

A: Arrhythmia is an abnormality or irregularity in the rhythm, rate, or sequence of the heartbeat.…

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

A: Heart  It is the main blood pumping organ of the body as it is formed of Cardiac muscles. There are…

Q: The ramp potential of pacemaker cells is caused by the opening of the: The ramp potential of…

A: Introduction  The steady, positive increase in voltage across the membrane of the heart's pacemaking…

Q: During the period of isovolumic contraction: A. the AV-valves are open and the aortic & pulmonary…

A:

Q: The onset of the QRS complex of the ECG is most closely related to which of the following cardiac…

A: Isovolumetric ventricular contraction - This phase marks the beginning of systole and starts with…

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

A: Blood pressure is the pressure of circulating blood against the walls of blood vessels. Blood…

Q: A. begins with closure of the AV-valves and ends with opening of the valves B. begins with opening…

A: There are two types of atrioventricular valves. The mitral and the tricuspid valves, also known as…

Q: All of the following are correct about the isovolumetric contraction, except  ____________.…

A: Isovolumetric contraction is that phase of cardiac contraction in which there is no appreciable…

Q: The following is correct about valvular structures A. The AV valves are the structures that divide…

A: The heart is a muscular organ that pumps oxygenated blood to the aorta, which conveys it to the…

Q: Which of the following is/are true concerning the opening and closing of the cardiac valves? A.…

A: Backward blood flow is prevented by the valves. On each end of the two ventricles are flaps that act…

Q: Which of the following describes ventricular pressure when AV valves are open and blood flows from…

A: The atrioventricular (AV) valves are an essential component of the human heart's structure and…