Which of the following delays the electrical impulse for muscle contraction, giving the atria time to contract completely and fill the ventricles with blood?
A. AV node
B. SA node
C. Purkinje fibers
D. Bundle of His
E. Bundle branches
A. AV node
The atrioventricular (AV) node delays the electrical impulse to allow for the atria to complete their contraction and ventricles to fill before the next contraction.
You might also like to view...
The term priapism means ________ and may be found in injuries of the ________
A) abnormal pulsation; abdomen B) unequal pupils; brain C) a persistent penile erection; spine D) a painful muscle spasm; spine
Physiological effects of adding a volume-limited inflation hold to mandatory breaths include which of the following?
1. Decreased PaCO2 2. Increased inspiratory time 3. Decreased VD/VT 4. Longer expiratory times a. 2 and 4 only b. 1, 2, 3, and 4 c. 3 and 4 only d. 1, 2, and 3 only
Fibrillation is _________________
A. a disturbance to the heartbeat B. a heart valve that is unable to close tightly C. a fast heart rate D. uncoordinated muscular activity in the heart muscle, which results in "quivering" rather than pumping action
E/M services during a global period that are unrelated to the procedure can be billed with what modifier?
A. -59 B. -24 C. -51 D. -25