Cardiac vs. Skeletal Muscle: Structure & Key Differences

Cardiac muscle and skeletal muscle are two types of muscle tissue that have different structures and functions.

Cardiac muscle is found only in the heart, while skeletal muscle is found throughout the body. Cardiac muscle is responsible for pumping blood through the body, while skeletal muscle is responsible for movement.

The main differences between the structure of cardiac muscle and skeletal muscle are:

* Cardiac muscle cells are branched, while skeletal muscle cells are long and cylindrical.

* Cardiac muscle cells have a single nucleus, while skeletal muscle cells have multiple nuclei.

* Cardiac muscle cells are striated, which means that they have a repeating pattern of light and dark bands. Skeletal muscle cells are also striated, but the pattern of light and dark bands is different.

* Cardiac muscle cells are connected by intercalated discs, which are specialized junctions that allow the cells to contract in a coordinated fashion. Skeletal muscle cells are not connected by intercalated discs.

* Cardiac muscle contracts involuntarily, while skeletal muscle contracts voluntarily.

These structural differences between cardiac muscle and skeletal muscle reflect their different functions. Cardiac muscle is designed to pump blood through the body continuously, while skeletal muscle is designed to produce movement.