Physio Ch 11

Question 1

It is composed of a P wave, a QRS complex and a T waves

Answer 1

Normal electrocardiogram

Question 2

The normal electrocardiogram is composed of?

Answer 2

P wave, QRS complex and T wave

Question 3

The QRS complex is often, but not always, three separate waves;

Answer 3

Q wave, R wave, S wave

Question 4

caused by electrical potentials generated when the atria depolarize before atrial contraction begins

Answer 4

P wave

Question 5

caused by electrical potentials generated when the ventricles depolarize before contraction, that is, as the depolarization wave spreads through the ventricles

Answer 5

QRS complex

Question 6

are both depolarization waves

Answer 6

P wave and QRS complex

Question 7

caused by potentials generated as the ventricles recover from the state of depolarization

Answer 7

T wave

Question 8

This process normally occurs in ventricular muscle 0. 25 and 0.35 second after depolarization

Answer 8

T wave

Question 9

T wave is known as?

Answer 9

repolarization wave

Question 10

The electrocardiograph is composed of?

Answer 10

depolarization and repolarization

Question 11

Atrial repolarization wave, known as the?

Answer 11

atrial T wave

Question 12

The ventricular repolarization wave is the ___________ of the normal electrocardiogram

Answer 12

T wave

Question 13

All recordings of electrocardiograms are made with appropriate ___________ on the recording paper

Answer 13

calibration lines

Question 14

voltage of the P wave

Answer 14

0.1 and 0.3

Question 15

voltage of the T wave between?

Answer 15

0.2 and 0.3

Question 16

the voltage of the QRS complex is usually?

Answer 16

1.0 to 1.5

Question 17

The time between the beginning of the P wave and the beginning of the QRS complex is the interval between the beginning of electrical excitation of the atria and the beginning of excitation of the ventricles. This period is called?

Answer 17

P-Q interval

Question 18

The normal P-Q interval

Answer 18

0.16 second

Question 19

Interval that often because the Q wave is likely to be absent

Answer 19

P-R interval

Question 20

Contraction of the ventricle lasts almost from the beginning of the Q wave (or R wave, if the Q wave is absent) to the end of the T wave. This interval is called?

Answer 20

Q-T interval

Question 21

The ordinarily Q-T interval is about?

Answer 21

0.35 second

Question 22

The normal interval between two successive QRS complexes in the adult person is about?

Answer 22

0.83 second

Question 23

The rate of heartbeat can be determined easily from an?

Answer 23

electrocardiogram

Question 24

electrical currents generated by the?

Answer 24

cardiac muscle

Question 25

electrical connections between the patient's limbs and the electrocardiograph for recording electrocardiograms from the so called?

Answer 25

standard bipolar limb leads

Question 26

means that the electrocardiogram is recorded from two electrodes located on different sides of the heart

Answer 26

bipolar

Question 27

is not a single wire connecting from the body but a combination of two wires connecting and their electrodes to make a complete circuit between the body and the electrocardiograph

Answer 27

lead

Question 28

the triangle that drawn around the area of the heart. Illustrates that the two arms and the left leg form apices of a triangle surrounding the heart

Answer 28

Einthoven's triangle

Question 29

states that if the electrical potentials of any tro of the three bipolar limb electrocardiographic leads are known at any given instant

Answer 29

Einthoven's law

Question 30

This electrode is connected to the positive terminal of the electrocardiograph and the negative electrode called the?

Answer 30

indifferent electrode

Question 31

it is connected through equal electrical resistances to the right arm, left arm and left leg all the same time

Answer 31

indifferent electrode

Question 32

Six standard chest leads are recorded, one at a time, from the anterior chest wall, the chest electrode being placed sequentially at the six points. The different recordings are known as?

Answer 32

leads V1, V2, V3, V4, V5, V6

Question 33

what leads that the QRS recordings of the normal heart mainly negative?

Answer 33

V1 and V2

Question 34

leads of QRS complexes that are mainly positive because the chest electrode in these leads is nearer the heart apex, which is the direction of electropositivity during most of depolarization

Answer 34

Leads V4, V5, V6

Question 35

type of recording, that the two of the limbs are connected through the electrical resistances to the negative terminal of the electrocardiograph, and the third limb is connected to the positive terminal

Answer 35

Augmented Unipolar Limb Leads

Question 36

When the positive terminal is on the right arm, the lead is known as?

Answer 36

aVR lead

Question 37

When the positive terminal is on the left arm, the lead is known as the?

Answer 37

aVL lead

Question 38

When the positive terminal is on the left leg, the lead is known as the?

Answer 38

aVF lead