Muscle

Muscle is contractile animal tissue made of specialized fibers, connective tissue, and associated fat. Its contractions generate force for movement, posture, and internal processes such as pumping blood.

Muscle contraction: Muscle contraction is the process by which muscle generates force, usually by shortening or resisting stretch. It describes the force-producing action shared by muscle tissue.
Skeletal muscle: Skeletal muscle is striated muscle usually attached to bones and controlled voluntarily. It is the muscle type most directly responsible for deliberate body movement.
Locomotion: Locomotion is the movement of an organism from one place to another. Skeletal muscle produces much of the force that moves animals through their environment.
Nervous tissue: Nervous tissue consists of neurons and supporting cells specialized for communication and information processing. It signals and coordinates muscle activity but does not produce force by contraction.
Sliding filament theory: Sliding filament theory explains muscle contraction through actin and myosin filaments sliding past one another. It explains how microscopic changes in muscle fibers produce contraction.
Cardiac muscle: Cardiac muscle is the specialized striated tissue that forms the muscular walls of the heart. Its coordinated contractions propel blood through the circulation.
Posture: Posture is the arrangement and maintenance of body parts against gravity. Continuous muscle activity stabilizes the body while standing or sitting.
Epithelial tissue: Epithelial tissue covers body surfaces, lines cavities, and forms many glands. Unlike muscle, its main roles are barrier formation, secretion, and absorption.
Neuromuscular junction: The neuromuscular junction is the synapse where a motor neuron communicates with a skeletal muscle fiber. It is the neural control point that initiates skeletal muscle activity.
Smooth muscle: Smooth muscle is nonstriated muscle found in the walls of organs and blood vessels. It moves substances and regulates the diameter of internal passages.

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