Cardiology Quiz 5

Question 1

The ________ refractory period is when the cardiac muscle has not re-polarized sufficiently to accept any depolarization impulse.

Answer 1

Absolute

Question 2

The P wave represents ________ depolarization.

Answer 2

Atrial

Question 3

The QRS complex represents ________ depolarization.

Answer 3

Ventricular

Question 4

Increased calcium influx into the cell during phase 2 of depolarization would [increase / decrease] the length and force of cardiac contraction.

Answer 4

Increase

Question 5

The ________ refractory period indicates the time when a sufficiently strong impulse could cause cardiac depolarization, even if the cell has not returned to full resting membrane potential.

Answer 5

Relative

Question 6

Phase ___ is the opening of the gated (fast) sodium channels, leading to depolarization of the cardiac cells.

Answer 6

0

Question 7

The _____ nerve descends from the medulla, and innervates the atria only.

Answer 7

Vagus

Question 8

________ autonomic stimulation results in decreased heart rate.

Answer 8

Parasympathetic

Question 9

________ autonomic stimulation results in increased heart rate, and force of contractions.

Answer 9

Sympathetic

Question 10

The normal resting membrane potential of the cardiac cells is ___ mV.

Answer 10

-90

Question 11

The PRI is normally ___ - ___ seconds.

Answer 11

.12 - .20

Question 12

The _____ syncytium contracts superior to inferior.

Answer 12

Atria

Question 13

_____ foci are cells other than pacemaker cells that depolarize, causing contractions.

Answer 13

Ectopic

Question 14

Normal QRS duration is less than ____ seconds for an adult.

Answer 14

0.12

Question 15

The ________ muscles connect to the chordae tendineae to prevent regurgitation of blood back into the atria from the ventricles.

Answer 15

Papillary