Question

What is the structure of cardiac muscle?

Answer 1

Cardiac muscle tissue is only found in the heart. Highly coordinated contractions of cardiac muscle pump blood into the vessels of the circulatory system. Similar to skeletal muscle, cardiac muscle is striated and organized into sarcomeres, possessing the same banding organization as skeletal muscle However, cardiac muscle fibers are shorter than skeletal muscle fibers and usually contain only one nucleus, which is located in the central region of the cell. Cardiac muscle fibers also possess many mitochondria and myoglobin, as ATP is produced primarily through aerobic metabolism. Cardiac muscle fibers cells also are extensively branched and are connected to one another at their ends by intercalated discs. An intercalated disc allows the cardiac muscle cells to contract in a wave-like pattern so that the heart can work as a pump.

Answer 2

Cardiac muscle exists only within the heart of animals.
It is a specialized form of muscle evolved to continuously and repeatedly contract, providing circulation of blood throughout the body.
The heart is a relatively simple organ.

Through all the twists and turns and various chambers, there are only three layers.