Question 1

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)S wave.
B)QRS complex.
C)T wave.
D)PR segment.

Accepted Answer

The PR interval measures the time from the onset of atrial depolarization (P wave) to the onset of ventricular depolarization (QRS complex).

Question 2

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

Accepted Answer

The straight line produced by the stylus when the EKG machine is turned on but not yet connected to the patient is called the isoelectric line. This means that there is no electrical activity being detected by the machine.

Question 3

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

Accepted Answer

The PR interval reflects the activity in the atria, specifically the time it takes for the electrical signal to travel from the sinoatrial (SA) node in the atria to the atrioventricular (AV) node, which then signals the ventricles to contract.

Question 4

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

Accepted Answer

Waves are the deflections above and below the isoelectric line on an ECG.

Question 5

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

Accepted Answer

The vertical lines on EKG graph paper indicate the passage of time, usually at a rate of 1 mm per 0.04 seconds.

Question 6

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

Accepted Answer

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

Question 7

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

Accepted Answer

The distance in time between two light vertical lines, or across one small square on EKG graph paper, is 0.04 seconds.

Question 8

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

Accepted Answer

The PR segment represents the short period of electrical inactivity between the end of the P wave and the start of the QRS complex, indicating the time the electrical impulse travels from the atria to the ventricles.

Question 9

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

Accepted Answer

A positive deflection on the EKG graph paper indicates that the flow of electricity is toward the electrode, while a negative deflection indicates that the flow of electricity is away from the electrode. Therefore, the best choice is D, positive.

Question 10

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

Accepted Answer

During the refractory period, the heart muscle cells are in a relative refractory phase which means that a stronger than usual stimulus could cause an abnormal premature discharge.

Question 11

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

Accepted Answer

The time between two heavy vertical lines on EKG graph paper is called an R-R interval, and it represents one complete heartbeat. The length of an R-R interval can be calculated by counting the number of small boxes between the two lines and multiplying by 0.04 seconds (since each small box represents 0.04 seconds). Therefore, 5 small boxes x 0.04 seconds per small box = 0.20 seconds per R-R interval. Hence, the best choice is option B.

Question 12

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

Accepted Answer

The elements of a single cardiac cycle include the P wave (representing atrial depolarization), PR segment (representing atrial contraction), PR interval (time for atrial depolarization and contraction), QRS complex (representing ventricular depolarization), and T wave (representing ventricular repolarization). The ST segment is not considered a distinct element of the cardiac cycle, but rather a period of time between ventricular depolarization and repolarization.

Question 13

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

Accepted Answer

A series of cardiac cycles is typically recorded on an EKG rhythm strip, which displays the electrical activity of the heart over time. Other choices, such as the P-P interval, QRS complex, and wave segment, refer to specific aspects of the EKG waveform rather than the collection of multiple cardiac cycles.

Question 14

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

Accepted Answer

A normal QRS complex duration is between 0.06 and 0.10 seconds. A duration of 0.20 seconds is not normal, indicating a possible block in the heart's conduction system.

Quiz 2: Waves and Measurements

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:

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

The PR interval reflects all activity.

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

The vertical lines on the EKG graph paper measure .

The horizontal lines on the EKG graph paper measure .

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

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

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

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

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

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

A series of cardiac cycles makes up an) :

Which of the following is NOT a normal QRS measurement?