What was one unique characteristic about cardiac muscle that was different from both of the other types of muscle tissue?

Answer AND Explanation:

The cardiac muscles form the wall of the heart. The fibres are made up of many cells, which are joined end to end through intercalated discs. They have more mitochondria than skeletal and smooth muscles. Cardiac muscle is myogenic meaning that the rhythmical contraction originates from within.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.