Question

multiple choice question
the nerves innervating cardiac muscle fibers:
are required to rhythmically stimulate the cardiac fibers to contract
can affect the rate and strength of contraction

Explanation:

Cardiac muscle fibers have an inherent ability to contract rhythmically (myogenic activity). However, the nerves innervating them can modulate the rate and strength of contraction through the autonomic nervous - system (sympathetic and parasympathetic). The sympathetic nervous system increases the heart rate and contractility, while the parasympathetic nervous system decreases the heart rate.

Answer:

can affect the rate and strength of contraction