Hi can you help me fill in this blank During embryonic devel

Hi can you help me fill in this blank. During embryonic development, ninety-nine percent of the cardiac fibers are specialized for the function called ____, whereas the remainder is specialized for _______.

Solution

First is Contractions of the heart; cardiac muscles are specialized fro pumping of blood throughout the body.

Second is autorhythmicity. The other cells evolved as pacemaker cells; the cells which require for maintaining the rhythm of heart.