34. When cut and removed from the body and placed in a suitable saline solution, the heart can be observed to continually beat. Which best explains this observation?
a. The saline solution keeps the heart beating.
b. There is natural pacemaker in the heart that initiates heart beat
c. The beating of the heart is under the control of organism.
d. The heart is multinucleated such that there are many points of regulating heart beat.
