Human muscular system

Muscular system of a human being

Baxromova Xushnoza

Muscular system

• Locomotion is provided by specialized muscle tissue
• It is composed of specialized cells, known as myocytes which have an ability to contract and relax

muscle

• A muscle cell consists of
• - sarcolemma (membrane) –
• - sarcoplasm (cytoplasm )
• It contains myofibrils (proteins)

Types of muscles

• Muscle tissue is divided into three groups:
• smooth
• striated skeletal
• striated cardiac

DRAW

Smooth muscle

• Each cell is long, fibrous and sharp-ended with a single central nucleus
• They are regulated by the autonomic nervous system (ANS) since they are located in organs that function involuntarily
• Their function is generally irregular and slow

Smooth muscle

• Smooth muscle cells participate in the structure of internal organs (digestive organs, walls of blood vessels) of humans

Cardiac muscle

• The nucleus is located at the center of each cell
• Each cell has branch-like projections
• Each cell is rich in blood and lymph vessels.

Skeletal muscle

• They cover the skeleton
• They provide locomotion in cooperation with the skeletal system
• Cells of striated muscles are long, cylindrical and multinucleated

Skeletal muscle

• They are termed muscle fibers due to their morphological appearance

Skeletal muscle

• The myofibrils composed of actin and myosin proteins
• They are arranged in parallel lines
• Striated skeletal muscle is voluntary and functions under the control of the brain
• It contracts rapidly