Muscular system

A muscle is a tissue whose cells can contract to produce movement or force.This occurs following the generation of mechanical energy from chemical reactions

Producing all body movements Stabilising the positions of the body, such as standing and sitting Storing and moving materials within the body, such as the blood in the heart and blood vessels Maintaining of the body temperature.

Excitability Contractility Extensibility Elasticity

the ability of the muscles to respond to stimuli (also known as irritability)

the ability of the muscles to contract forcefully after stimulation

the ability of the muscles to stretch without being damaged

the ability of the muscles to return to their normal size after contraction and relaxation.

smooth cardiac skeletal

Smooth muscles are non-striated and involuntary. They form the walls of the luminal structures such as blood vessels, airways, and most pelvic and abdominal organs. They are composed of spindle-shaped fibers with a centrally located nucleus.

Cardiac muscles have a striated pattern and exhibit rhythmic contractions due to sarcomeres, which are involuntary. They are responsible for the contraction and relaxation of the heart.

The tissue of skeletal muscles is made up of long, cylindrical fibers that have nuclei located on the outer edge. These muscles are striated and voluntary, and they are attached to the skeletal system. The primary function of skeletal muscles is to move the skeleton. Tendons connect muscles to the skeleton, while ligaments bind bone to bone.

Each skeletal muscle is made up of thousands of muscle fibers wrapped in connective tissue sheaths. The bundles of muscle fibers in skeletal muscle are called fascicles.

is the outer most connective tissue sheath surrounding the entire muscle

surrounds muscles bundles and the endomysium surrounds the muscle fibres

is a flesh like membrane that surrounds individual muscle fibres (myofibrils

basic contractile unit of a muscle fibre

Most muscles in the human body are attached to bones that form a joint. When a muscle contracts, it pulls one bone towards the other. The attachment of the muscle tendon to the stationary bone is known as the origin of the muscle. On the other hand, the attachment of the muscle tendon to the movable bone is known as the insertion of the muscle. The portion of the muscle between the tendons of origin and insertion is referred to as the belly of the muscle.

The axial muscular system, which includes the muscles of the head, vertebral column, and thoracic cage, constitutes about 60% of the entire muscular system.

The following are the different groups of muscles in the human body: 1. The muscles in the head and neck area that are responsible for facial expressions, swallowing, and chewing. 2. The muscles in the vertebral column that help in flexing and extending the spine and head. 3. The muscles in the trunk area that are located in the walls of the thoracic, abdominal, and pelvic cavities. 4. The muscles in the perineum, which connect the sacrum and coccyx to the lower part of the hip bones.