Defect Abnormal SA node firing resulting in abnormally slow resting heart rate Abnormal SA node firing resulting in abnormally fast resting heart rate and abnormal ventricular depolarization Conduction through the AV node fails, resulting in complete dissociation of atrial and ventricular contractions Atrial muscle cells depolarize prematurely, followed by conduction through the AV node, which causes ventricular contraction Ventricular muscle cells depolarize independently, resulting in completely disorganized electrical activity Ett # 1 sec 1 mV Normal 3 لسلہ سلسل السلسل 2 P P P 5 sipiphyr

Defect Abnormal SA node firing resulting in abnormally slow resting heart rate Abnormal SA node firing resulting in abnormally fast resting heart rate and abnormal ventricular depolarization Conduction through the AV node fails, resulting in complete dissociation of atrial and ventricular contractions Atrial muscle cells depolarize prematurely, followed by conduction through the AV node, which causes ventricular contraction Ventricular muscle cells depolarize independently, resulting in completely disorganized electrical activity Ett # 1 sec 1 mV Normal 3 لسلہ سلسل السلسل 2 P P P 5 sipiphyr

Biomedical Instrumentation Systems

1st Edition

ISBN:9781133478294

Author:Chatterjee

Publisher:Chatterjee

Chapter7: Instrumentation In Diagnostic Cardiology

Section: Chapter Questions

Problem 3Q

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Ventricular relaxation immediately follows ________. atrial depolarization ventricular repolarization ventricular depolarization atrial repolarization
The heart's internal pacemaker beats by: an internal implant that sends an electrical impulse through the heart the excitation of cardiac muscle cells at the sinoatrial node followed by the atrioventricular node the excitation of cardiac muscle cells at the atrioventricular node followed by the sinoatrial node the action of the sinus
Which ONE of the following statements is TRUE? OA Cardiac myocyte contraction results primarily from an increased concentration of intracellular Na OB Prazosin is an agonist at a2 adrenergic receptors OC Veins can accommodate large volumes of blood but this causes a large increase in pressure OD The pulse pressure is the addition of systolic and diastolic pressure OE The primary integrating centre for baroreceptor reflexes is the medullary cardiovascular centre
Fibrillation is abnormal, rapid contractions of different parts of the heartthat prevent the heart muscle from contracting as a single unit. Explainwhy atrial fibrillation does not immediately cause death but ventricularfibrillation does.
Autorhythmic cells in the SA node intrinsically fire at a rate of - 90 action potentials per minute. At rest, the heart rate is lowered primarily through modulation by: O Decreased delivery of acetylcholine and increased delivery of norepinephrine Increased delivery of acetylcholine and decreased delivery of norepinephrine Cardiac contractile cells Decreased delivery of acetylcholine and decreased delivery of norepinephrine Increased delivery of acetylcholine and increased delivery of norepinephrine O O O
Autorhythmic cells in the SA node intrinsically fire at a rate of - 90 action potentials per minute. During exercise, the heart ráte is increased primarily through modulation by: Increased sympathetic input and parasympathetic input Decreased sympathetic input and parasympathetic input The AV node O Decreased sympathetic input and increased parasympathetic input Increased sympathetic input and decreased parasympathetic input O O O OO
isovolumetric contraction isovolumetric relaxation ventricular filling ventricular ejection closed rises S1 drops depolarize S2 The first phase of the cardiac cycle is . This is when a lot of blood is in the atria, which causes atrial pressure to be higher than the ventricles. The atrioventricular valves open, and blood moves from the atria to the ventricles. At the end of this phase, the atria contract to maintain pressure and blood flow into the ventricles. As blood leaves the atria, the pressure in the atria As blood enters the ventricles, the pressure in the ventricles Towards the end of this phase, the pressure in the ventricles will exceed the pressure in the atria. At this point, the heart enters the second phase of the cardiac cycle: At this point, the AV valves shut, and we hear . The atria repolarize and the ventricles (due to the QRS complex of the ECG), causing ventricular contraction. Although contracting, it is not yet moving blood into the arteries. All 4 heart valves…
Determine the missing word/phrase to correctly complete the explanation of conduction of the heart beat. Heart Conduction & the ECG The signal along nerves to the This node is located in the the right atrium. An electrical signal is sent and causes The signal is received by the the This signal causes corresponds to the the ECG. This node sends a signal to through the hormone P wave heart. This corresponds to the hormone node in the heart. AV bundle branches R wave S-T P-Q segment segment increased in the brain sends a ; this corresponds to of the ECG. purkinjie fibers node located in the right atrium. There is a slight delay before the next heartbeat as the dissipates from the of the septum and to in the walls of the The sympathetic nervous system causes an heart rate due to the of the ECG. The parasympathetic nervous system causes a heart rate due to the T wave and of
The entry of calcium into a ventricular muscle cell helps to maintain depolarization of the membrane during the plateau phase of the action potential, but this calcium also performs what other function?
ERCISE 36 Electrical Activity of the Heart Use this grid to graph the heart rates observed after exercise. Be sure to label your graph completely and accurately. bon Put in Order (rearrange these heart structures in the order through which electrical signals are conducted in a single cardiac cycle) Put in Order 1. atrial myocardium AV bundle branches nim 2. AV bundle AV node subendocardial (Purkinje) fibers SA node 3. 4. 5. ventricular myocardium 6. Fill-in (complete each statement with the correct term) 7. 1. Relaxation of a heart chamber is called _?_. 2. Contraction of a heart chamber is called _?_. 3. The portion of the ECG that represents ventricular repolarization is the _?. 4. Leads I, II, and III together are called the _?_ leads, or appendicular leads. 5. ? is the condition of elevated heart rate. Fill-in 1. 2. 3. 4. 5. a 0010 bu Floouior Inc All rights reserved.
Repolarization of ventricular myocardiocytes is caused by ______ the cells through voltage-gated channels. A potassium entering B potassium leaving C sodium entering D sodium leaving E calcium entering
Put the progression of the electrical excitation of the heart muscle in the right order Atrial walls Sa nodes AV bundle AV node Purkinje fibers