Quiz 2 Review + Practice Questions Flashcards
What does the P wave represent in an ECG?
atrial depolarization
Which of the following intervals represents ventricular depolarization and repolarization?
A) PR
B) ST
C) RR
D) QT
D) QT
What does an elevated ST segment indicate in an ECG?
MI
What does the QRS complex represent in an ECG?
ventricular depolarization
What is the normal duration of the QRS complex in an ECG?
0.04 to 0.10 seconds
What does the T wave represent in an ECG?
ventricular repolarization
What does a wide QRS complex indicate in an ECG?
bundle branch block
An ECG strip is marked with a time scale of 25 mm/sec. If a complete cardiac cycle on the ECG strip measures 22 mm, what is the heart rate?
68
(22x 0.04 =0.88, 60/0.88= 68)
If a person’s heart rate is 72 bpm, what is the duration of one cardiac cycle?
0.83
(60/72= 0.83)
When my heart rate is 65 bpm, my cardiac cycle length is ________. My heart rate then goes up to 125 bpm when I’m at the gym. How long is it now? _________
0.92 sec, 0.48 sec
(60/65= 0.92, 60/125= 0.48)
When compared to a normal PV loop, a loop representing an increased force of contraction would be?
wider to the left
On the graph below, which statement describes A?
mitral valve closes
The Fick principle or law is used to measure?
cardiac output
What effect would an increase in venous return have on cardiac output?
increase cardiac output
The greatest delay in the electrical conduction across the heart occurs at the?
AV node
According to the Frank-Starling law, as EDV increases, ________________
SV increases
Which of the following intervals on an ECG represents the time taken for the impulses to travel from the atria to the ventricles?
A) PR interval
B) PT interval
C) QT interval
D) ST segment
E) QRS wave
A) PR interval
A ventricular action potential can be divided into 5 phases. Put the events in order
1) fast sodium channels open
2) fast sodium channels close
3) L type calcium channels open and fast potassium channels close
4) L type calcium channels close and slow potassium channels open
5) repolarize to rest, all channels closed
Which of the following structures is located beneath the endocardium of the ventricular septum?
A) SA node
B) internodal pathways
C) AV node
D) bundle of his
E) purkinje fibers
D) bundle of his
The Fick principle states that cardiac output is proportional to
the rate of oxygen consumption and difference between arterial and venous blood
The graph shows left ventricular volume and pressure loop. Isovolumetric contraction occurs when?
A to B
On the graph shown, what event is shown by the line labeled 2?
systolic ejection
The heart rate of the individual getting this ECG is _______ bpm
71
(21x0.04= 0.84, 60/ 0.84=71)
Which of the following waves on ECG represents atrial repolarization?
A) P
B) R
C) S
D) T
E) none of the above
E) none of the above
