LABORATORY MANUAL FOR HUMAN ANATOMY & PH
4th Edition
ISBN: 9781260254426
Author: Martin
Publisher: MCG
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Textbook Question
Chapter 45, Problem 6PL
The depolarization of ventricular fibers is indicated by the ________ of an ECG.
a. P wave
b. QRS complex
c. T wave
d. P-Q interval
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Students have asked these similar questions
An ECG would be used to diagnose all of the following conditions except _________.
Select one:
a.AV block
b.ectopic pacemaker
c.angina pectoris
d.premature atrial contractions
e.ventricular tachycardia
In electrocardiography (=EKG, =ECG), what causes a P wave?______
A.
atrial repolarization
B.
ventricular repolarization
C.
atrial depolarization
D.
ventricular depolarization
On an ECG, if every other P wave (e.g., every even is, and every odd is not) is NOT followed by the QRS complex, this is:
A. first degree AV block
B. second degree AV block
C. third degree AV block
D. atrial fibrillation
Chapter 45 Solutions
LABORATORY MANUAL FOR HUMAN ANATOMY & PH
Ch. 45 - The _______ of the conduction system is known as...Ch. 45 - The ________ of the conduction system is/are...Ch. 45 - The first of two heart sounds (lubb) occurs when...Ch. 45 - One cardiac cycle would consist of a. left chamber...Ch. 45 - The SA node of the heart is located in the a....Ch. 45 - The depolarization of ventricular fibers is...Ch. 45 - The dupp sound occurs when the semilunar valves...Ch. 45 - The P wave of an ECG occurs during the...Ch. 45 - The period during a heart is contracting is called...Ch. 45 - The period during which a heart chamber is...
Ch. 45 - During ventricular contraction, the AV valves...Ch. 45 - During ventricular relaxation, the AV valves are...Ch. 45 - The pulmonary and aortic valves open when the...Ch. 45 - The first sound of a cardiac cycle occurs when the...Ch. 45 - The second sound of a cardiac cycle occurs when...Ch. 45 - The sound created when blood leaks back through an...Ch. 45 - What changes did you note in the heart sounds when...Ch. 45 - What changes did you note in the heart sounds...Ch. 45 - Prob. 3.1ACh. 45 - The ____________________ node is located in the...Ch. 45 - The fibers that carry cardiac impulses from the...Ch. 45 - Prob. 3.4ACh. 45 - The P wave corresponds to depolarization of the...Ch. 45 - The QRS complex corresponds to depolarization of...Ch. 45 - The T wave corresponds to repolarization of the...Ch. 45 - Why is atrial repolarization not observed in the...Ch. 45 - Identify the heart chambers and conduction system...Ch. 45 - How much time passed from the beginning of the P...Ch. 45 - What is the significance of this P-R interval?Ch. 45 - How can you determine heart rate from an...Ch. 45 - As blood in the ventricles surges back against the...
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- The term _________________ ECG means a record or picture of the electrical activity of the heart electr/o means electric, and cardi/o means heart.arrow_forwardWhich heart chamber has the thickest wall? a. right atrium c. left atrium b. right ventricle d. left ventriclearrow_forwardThe patient's ECG indicates that _____. A action potentials are passing from his atria into his ventricles before they are supposed to B he is suffering from ventricular fibrillation C the patient is suffering from a first degree cardiac block D the patient has atrial fibrillation E the patient is suffering from a second degree cardiac blockarrow_forward
- Using the ECG recording provided below, how do we know that this extrasystole event (i.e., indicated by the arrow) is occurring in the ventricles and not the atria? a. None of the options are correct b. Extrasystole event is smaller in amplitude than the QRS complex c.Event occurs after a T-wave d.Large ECG amplitude compared with the P-wave e.Event occurs after a P-wavearrow_forwardThis abnormal ECG indicates: A ventricular fibrillation B premature ventricular contractions (PVCs) C ST-segment elevation D premature atrial contractions (PACS) hahaharrow_forwardWithin the T-P interval of the EKG... a. The 2nd heart sound is heard b. the semilunar valves are open c. Ventricular pressure is higher than atrial pressure d. Ventricular cardiomyocytes are relaxed e. L-type calcium current is dominant in the ventricular cardiomyocytesarrow_forward
- On an electrocardiogram (EKG), the electrical resetting of the ventricles is a. shown by the P wave b. hidden by the ORS complex c. shown by the T wave d. hidden by the P wave e. shown by the QRS complexarrow_forwardIn regards to the EKG all of the following are correct except A. The P-wave is also known as atrial systole B. The QRS complex represents ventricular systole C. DJ wave is a normal wave seen an atrial repolarization D. The T waves also ventricular diastole Choose the correct answerarrow_forwardIn the following ECG diagram, Which of the following is the right diagnosis? Atrial fibrillation. b. Ventricular fibrillation c. Angina pectoris. d. Myocardial infarction. e. Third degree heart block.arrow_forward
- Drugs that increase the heart rate have __________a effect.a. myogenicb. negative inotropicc. positive inotropicd. negative chronotropice. positive chronotropicarrow_forwardWhich of the following is true of the EKG? A. Depolarization of the atria cannot be seen on the EKG B. Repolarization of the atria cannot be seen on the EKG. C. Depolorization of the ventricles cannot be seen on the EKG. D. Repolorazition of the ventricles cannot be seen on the EKG.arrow_forwardAction potentials in the ventricular cardiomyocytes differ from those in the SA node in that action potentials in the ventricular myocardiocytes __________. A involve voltage-gated Ca+2 channels whereas those in the SA node do not B occur less frequently; only every other action potential in the SA node causes an action potential in the contractile cells. C begin at a less negative baseline because the SA node cells have more K+ channels D have an initial spike due to fast voltage-gated Na+ channelsarrow_forward
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