Unit 4 Muscle Tissue Types

Skeletal Muscle Tissue

• Histological Structure

  • Skeletal muscle fibers are characterized as being long and cylindrical in shape.

  • The tissue exhibits striations (a striped appearance).

  • Each skeletal muscle fiber contains many nuclei (multinucleated).

  • These nuclei are peripherally located, meaning they are situated at the edges of the cell rather than the center.

• Functions

  • Facilitates voluntary movement of the body.

  • Responsible for the production of heat as a metabolic byproduct of contraction.

  • Provides physical protection for internal organs.

Cardiac Muscle Tissue

• Histological Structure

  • Cardiac muscle fibers are characterized as being short and branched.

  • Similar to skeletal muscle, cardiac muscle tissue is striated.

  • Each cell typically contains a single central nucleus.

• Functions

  • The primary function is to contract in a coordinated manner to pump blood throughout the circulatory system.

Smooth Muscle Tissue

• Histological Structure

  • Smooth muscle fibers are short and spindle-shaped (tapered at both ends).

  • Unlike skeletal and cardiac muscle, smooth muscle has no evident striation, appearing smooth under a microscope.

  • Each muscle fiber contains a single nucleus.

• Functions

  • Responsible for various types of involuntary movement within the body.

  • Facilitates the movement of food through the digestive tract.

  • Provides involuntary control of respiration.

  • Facilitates the movement of secretions through various ducts.

  • Regulates the flow of blood within the arteries through the process of contraction.