Q. In frog’s heart which of the following is considered as pace-maker?
A) Pylangium
B) Synangium
C) Sinus venosus
D) Truncus arteriosus
Explanation
In the frog is heart, the pace maker is the sinus venosus, an enlarged region between the vena cava and the right atrium. The mammalian SA noade is believed to be an evolutionary remnant of the sinus venosus.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.