Describe the structure of cardiac muscle tissue.

(N/A) Cardiac muscle tissue is a contractile tissue present only in the heart.
$1$. Structure: Cardiac muscle cells are cylindrical,branched,and uninucleated (or sometimes binucleated),with the nucleus located centrally.
$2$. Striations: These muscles are striated,meaning they possess alternating dark and light bands ($A$ and $I$ bands) similar to skeletal muscles.
$3$. Intercalated Discs: $A$ unique feature of cardiac muscle is the presence of intercalated discs at the junctions between adjacent cells. These are specialized cell junctions that allow the cells to contract as a single unit by facilitating rapid communication through gap junctions.
$4$. Connective Tissue: The intercellular spaces are filled with loose connective tissue (endomysium) containing a network of collagen fibers.
$5$. Function: They are involuntary in nature and contract rhythmically throughout life without fatigue.