Cardiac muscle has what identifying characteristic? Striations Intercalated discs Multi-nucleated cells The colour A single nucleus per cell

Cardiac muscle, also known as myocardium, has several identifying characteristics:

1. Striations: Like skeletal muscle, cardiac muscle is striated. This is due to the arrangement of the contractile proteins actin and myosin within the muscle cells.

2. Intercalated discs: These are unique to cardiac muscle. They are specialized structures that allow for the rapid spread of electrical signals between cells, enabling the heart to contract as a unit.

3. Single nucleus per cell: Unlike skeletal muscle, which is multi-nucleated, cardiac muscle cells typically have a single nucleus.

4. The color of cardiac muscle is typically described as being a dark red color. This is due to the high levels of myoglobin, a protein that binds oxygen, in the cells.

So, the identifying characteristics of cardiac muscle are striations, intercalated discs, a single nucleus per cell, and its color.