Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Question
Match the following parts of an ECG tracing to the events in the heart that happen at the same time.
QRS complex
Beginning of p wave
Period between t wave and the next p wave
Completion of p wave
Heart events
The SA node fires
Depolarization of the ventricles
The ventricles fill with blood
The atria contract
Expert Solution
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Step 1: Introduction to ECG
ECG stands for Electrocardiogram. It is a medical test that detects heart problems by measuring the electrical activity generated by the heart as it contracts. The ECG can measure the rate and regularity of heartbeats, the size and position of the heart chambers, the presence of any damage to the heart, and the effects of drugs or devices used to regulate the heart, such as a pacemaker.
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- Put the following events in the proper order for cardiac conduction. Group of answer choices: SA Node initiates action potential AV node initiates action potential Signal moves to AV bundle in between the ventricle Purkinje fibers lead to ventricular contraction Signal travels to AV node Purkinje fibers lead to atrial contraction 1 2 3 4arrow_forwardYou are learning to read electrocardiograms. You know that the patient you are examining has a pathology affecting the depolarization of his ventricles, therefore you're looking for a change in what portion of his EKG? The P wave O The T wave O The QRS complex "The P wave" or "The T wave" but not "The QRS complex". None of these would be alteredarrow_forwardduring the four phases of the cardiac cycle. Which valves open/close during these phases? Ventricular Isovolumetric Ventricular Isovolumetric Filling Contraction Ejection Relaxation Blood Flow Low Ventricular Volume Ventricular Pressure Aortic Pressure Which valves open/close in the beginning ofarrow_forward
- Discuss why the heart is called a double pump and compare the pulmonary and systemic circuits.arrow_forwardAn individual presents with cardiac tamponade. Their heart would be the most efficient in pumping out blood during which of the following?arrow_forwardWhat is happening during the phase labeled with the arrow? Atrial depolarization Ventricular depolarization Ventricular repolarization or AV valve closurearrow_forward
- You are presented with a stack of ECGs on your fist day of your cardiology rotation and are given a single instruction: “read them”. As you progress through the pile, you note the following abnormalities. Explain form where in the heart of the cardiac conduction system each abnormality might have come: Absent P waves Abnormally long QRS complex Abnormally long P-R interval Extra QRS complexarrow_forwardThe marks a spot of dead myocardial cells. How does this change the depolarization and muscle contraction patterns in specific locations of the heart? M Pulmonary semilunar valve Aortic semilunar valve Right AV- valve Left AV valvearrow_forwardA patient has a condition in which the SA node is no longer functioning. The atrioventricular (AV) node is now setting the pace and rhythm for the heart. What difference would you expect to see in the ECG of this patient? Group of answer choices P wave would be much larger than normal there would continue to be a normal sinus rhythm QRS complex would be absent the rhythm would be slowerarrow_forward
- which of the following is the first to occur during the period of ventricular systole? QRS complex, sharp rise and ventricular pressure, or blood leaving the ventricle.arrow_forwardA class of drugs called beta-blockers are commonly prescribed to cardiac patients in order to reduce their heart rate. Beta-blockers slow heart rate by reducing the conduction of action potentials through the A-V (atrioventricular) node. The most likely effect on an ECG shorter R-R interval shorter Q-T interval longer P-R interval longer T wavearrow_forwardThe left AV valve has only two large leaflets, while the right AV valve has three smaller leaflets. It is a general principle of physiology that structure is a determinant of—and has coevolved with—function. Although it is unknown why the two valves differ in structure in this way, what difference in the functional demands of the left side of the heart might explain why there is one less valve leaflet than on the right side?arrow_forward
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