It directly stimulates ventricular contraction

It delays the electrical impulse to allow ventricular filling

It prevents backflow of blood into the atria

It serves as the primary pacemaker, initiating the heartbeat

Only skeletal muscle uses actin and myosin for contraction

Cardiac muscle contraction is involuntary, while skeletal muscle contraction is voluntary

Skeletal muscle does not require calcium for filament sliding, but cardiac muscle does

The sliding filament mechanism occurs only in cardiac muscle, not in skeletal muscle

The average of the size is more than 5.

The average of the size is less than 5.

The average of the size is not equal to 5.

The average of the size is equal to 5.