Question 1

A strong impulse can cause a premature abnormal discharge during the ________ refractory period.
A)original
B)absolute
C)relative
D)impulse

Accepted Answer

During the relative refractory period, a stronger-than-normal impulse can trigger an abnormal discharge.

Question 2

The PR interval begins at the first sign of the P wave and ends at the first sign of the next deflection,which is called the:
A)T wave.
B)S wave.
C)PR segment.
D)QRS complex.

Accepted Answer

The PR interval measures the time from the onset of atrial depolarization (P wave) to the onset of ventricular depolarization (QRS complex). It does not end with the T wave, S wave, or PR segment.

Question 3

Which of the following best describes the elements of a single cardiac cycle?
A)P wave,PR segment,and PR interval
B)P wave and QRS complex
C)QRS complex,ST segment,and T wave
D)P wave,PR segment,PR interval,QRS complex,and T wave

Accepted Answer

A single cardiac cycle includes the P wave (atrial depolarization), PR segment and PR interval (delay at the AV node), QRS complex (ventricular depolarization), and T wave (ventricular repolarization).

Question 4

A series of cardiac cycles makes up a(n):
A)EKG rhythm strip.
B)QRS complex.
C)P-P interval.
D)wave segment.

Accepted Answer

A series of cardiac cycles is typically recorded on an EKG rhythm strip, which shows the electrical activity of the heart over time. The QRS complex and P-P interval are individual components of the EKG rhythm strip, while the wave segment is a portion of the EKG tracing between two waves.

Question 5

The horizontal lines on the EKG graph paper measure:
A)time.
B)speed.
C)pattern.
D)voltage.

Accepted Answer

The answer of The horizontal lines on the EKG graph...

Question 6

The deflections above and below the isoelectric line are referred to as:
A)intervals.
B)segments.
C)pauses.
D)waves.

Accepted Answer

The deflections above and below the isoelectric line in an ECG are referred to as waves, such as the P wave, QRS complex, and T wave. Intervals and segments are terms used to describe specific portions of the ECG, while pauses typically refer to an abnormality in electrical activity.

Question 7

The distance between two "tic" marks is ________ sec.
A)3
B)4
C)5
D)6

Accepted Answer

The distance between two "tic" marks is 3 sec.

Question 8

The PR interval reflects all ________ activity.
A)mechanical
B)atrial
C)cardiac
D)ventricular

Accepted Answer

The PR interval on an electrocardiogram (ECG) reflects the time it takes for electrical impulses to travel from the atria to the ventricles. Therefore, it primarily reflects atrial activity.

Question 9

The vertical lines on the EKG graph paper measure:
A)time.
B)speed.
C)pattern.
D)voltage.

Accepted Answer

The vertical lines on the EKG graph paper represent time, with each small box measuring 0.04 seconds and each large box measuring 0.2 seconds. This allows for the measurement of the timing of different components of the EKG waveform, such as the duration of the P waves or QRS complexes.

Question 10

No impulse can cause depolarization during the ________ refractory period.
A)original
B)absolute
C)relative
D)impulse

Accepted Answer

During the absolute refractory period, no impulse can cause depolarization as the voltage-gated sodium channels are inactivated and cannot open, regardless of the strength of the stimulus. This ensures that the neuron cannot fire another action potential and allows for the proper propagation of nerve impulses in one direction.

Question 11

The short period of electrical inactivity between the end of the P wave and the start of the QRS complex is called the:
A)P pause.
B)PR segment.
C)PR interval.
D)PR pause.

Accepted Answer

The PR segment is defined as the short period of electrical inactivity between the end of the P wave and the start of the QRS complex. The other choices (A, C, and D) are not accurate descriptions of this electrical phenomenon.

Question 12

On EKG graph paper,the distance in time between two light vertical lines,or across one small square,is ________ sec.
A)0.04
B)0.08
C)0.12
D)0.20

Accepted Answer

The distance between two light vertical lines or across one small square on EKG graph paper is 0.04 seconds, also known as 1 small box or 1 mm.

Question 13

On EKG graph paper,the time between two heavy vertical lines is five small boxes,or ________ sec.
A)0.04
B)0.08
C)0.12
D)0.20

Accepted Answer

Each small box on EKG graph paper represents 0.04 seconds, so five small boxes equal 0.20 seconds.

Question 14

The EKG machine produces an upright deflection on the graph paper if the flow of electricity is toward the ________ electrode.
A)positive
B)negative
C)straight
D)inverted

Accepted Answer

An upright deflection on EKG graph paper signifies that the flow of electricity is towards the positive electrode.

Question 15

When an EKG machine is turned on but not yet connected to the patient,the stylus produces a straight line called the ________ line.
A)equal force
B)isoelectric
C)standard
D)straight

Accepted Answer

The isoelectric line is the baseline of an EKG tracing and represents the absence of electrical activity.

Question 16

Which of the following is NOT a normal QRS measurement?
A)0.08
B)0.20
C)0.11
D)0.06

Accepted Answer

The normal QRS complex duration on an electrocardiogram (ECG) is 0.06 to 0.10 seconds. A QRS duration of 0.20 seconds is not normal, indicating a delay in ventricular conduction.

Quiz 2: Waves and Measurements

A strong impulse can cause a premature abnormal discharge during the ________ refractory period.

The PR interval begins at the first sign of the P wave and ends at the first sign of the next deflection,which is called the:

Which of the following best describes the elements of a single cardiac cycle?

A series of cardiac cycles makes up a(n) :

The horizontal lines on the EKG graph paper measure:

The deflections above and below the isoelectric line are referred to as:

The distance between two "tic" marks is ________ sec.

The PR interval reflects all ________ activity.

The vertical lines on the EKG graph paper measure:

No impulse can cause depolarization during the ________ refractory period.

The short period of electrical inactivity between the end of the P wave and the start of the QRS complex is called the:

On EKG graph paper,the distance in time between two light vertical lines,or across one small square,is ________ sec.

On EKG graph paper,the time between two heavy vertical lines is five small boxes,or ________ sec.

The EKG machine produces an upright deflection on the graph paper if the flow of electricity is toward the ________ electrode.

When an EKG machine is turned on but not yet connected to the patient,the stylus produces a straight line called the ________ line.

Which of the following is NOT a normal QRS measurement?