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

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 4RE

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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
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
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
Be able to describe the significance of ryanodine receptors found on the SR of cardiac contractile cells.
When the heart's electrical system misfires, it's called atrial [term]. The heart starts generating electrical impulses in more than one place, not just in the SA node.
Cardiomyocyte action potential 3 4 5 2 1 0.15 0.30 time (s) For our course, "regular" cardiocytes are cardiocytes that are NOT part of the SA node. Please use the word bank to complete the following statements: (choices can be used more than once, obviously) voltage-gated calcium channels voltage-gated sodium channels voltage-gated potassium channels stable not stable Unlike SA node cardiocytes, regular cardiocytes have a resting membrane potential that is Regular cardiocytes become stimulated when calcium and sodium pass fro neighboring excited cardiocytes through gap junctions (see 1). This causes to open, resulting in the regular cardiocytes to sharply depolarize (see 2). At 3, these channels close, and open, resulting in both depolarization and sarcomere contraction. Also at 3, open, causing the cell to repolarize. The opposing forces, (depolarization and repolarization) of the two channels that are open simultaneously, results in a plateau (see 4). This plateau continues until…
If the S-A node discharges at 0.00 seconds, when will the action potential arrive at ventricular septum after passing through AV node