Question

which of the following are characteristics of cardiac muscle cells?
check all that apply

they are highly resistant to fatigue.

they are autorhythmic.

their contractions are synchronized.

they are under voluntary control.

Explanation:

Cardiac muscle cells are highly resistant to fatigue as the heart needs to pump continuously. They are autorhythmic (can generate their own electrical impulses to contract). Their contractions are synchronized due to gap junctions that allow electrical signals to pass between cells. However, they are not under voluntary control (unlike skeletal muscle).

Answer:

They are highly resistant to fatigue., They are autorhythmic., Their contractions are synchronized.