Non-striated muscle, also known as smooth muscle, is a type of involuntary muscle tissue found in the walls of hollow organs like the stomach, intestines, blood vessels, and urinary bladder. Unlike skeletal and cardiac muscle, it lacks the striped (striated) appearance under a microscope because its actin and myosin filaments are not arranged in a regular pattern.

Key characteristics of non-striated muscle:

Spindle-shaped cells with a single, centrally located nucleus.
No striations (stripes) due to irregular filament arrangement.
Involuntary control (controlled by the autonomic nervous system).
Contracts slowly and rhythmically.

While I cannot draw a diagram, here is a detailed description for labeling:

Neat Labelled Diagram Description:

Cell (Fibre): Spindle-shaped, elongated cell with tapered ends.
Nucleus: Single, oval-shaped nucleus located in the center of the cell.
Cytoplasm: Appears smooth and homogeneous without striations.
Cell Membrane: The outer boundary of the muscle cell.

Related Topics:

Muscle Types: There are three types of muscle tissue: skeletal (striated and voluntary), cardiac (striated and involuntary), and smooth (non-striated and involuntary). Non-striated muscle is responsible for involuntary movements like peristalsis in the gut and controlling blood flow in arteries.

Formulae: While there are no direct mathematical formulae for muscle structure, the force of contraction in smooth muscle can be described by principles similar to other muscle types, involving calcium ions (Ca²⁺) and the sliding filament theory, though the mechanism is slower and more sustained.