The AV node
a. is the normal pacemaker of the heart.
b. is the only electrical connection between the atria and the ventricles.
c. rapidly conducts the impulse from the atria to the ventricles so that they contract simultaneously.
d. is not innervated by the vagus.
e. has the fastest rate of depolarization in the heart.
B
You might also like to view...
Name the layer labeled D
a) Submucosa b) Serosa c) Longitudinal muscle d) Mucosa e) Circular muscle
If the extracellular fluid around a neuron is replaced with an isotonic saline solution that contains K+ and other solutes at concentrations very close to the extracellular fluid concentrations of a normal cell, the result is
A. hyperpolarized membrane. B. no resting membrane potential. C. a resting membrane potential close to its normal value. D. depolarized membrane. E. None of the choices are correct.
The epithelium of tonsilla palatina is:
(A) multistratified non - keratinizing epithelium (B) multistratified keratinizing epithelium (C) Henle's epithelium (D) Pseudostratified ciliated epithelium
The posterior portion of the knee is known as the ________ region.
Fill in the blank(s) with the appropriate word(s).