Muscular system study Flashcards
Muscle fiber
Usually has a single motor end plate. Muscle fibers and their associated connective tissues are flexible but can tear if overstretched.
Myosin
A protein that, with actin, forms the filaments that contract muscle fibers
Actin
A protein that forms filaments of the protein myosin, contracting muscle fibers
Sarcomeres
The structural and functional units of a myofibril
Sliding Filament Model
Includes all the events involving muscle contraction, and it gets its name from the way sarcomeres shorten. Thick and thin filaments do not change length. Rather, they slide past one another, with the thin filaments sliding toward the center of the sarcomere from both ends.
Fast Twitch
fatigable
Slow Twitch
fatigue-resistant
Peristalsis
Rhythmic waves of muscular contraction in the walls of certain tubular organs.
Origin
The end of a muscle that attaches to a relatively immovable part
Insertion
The end of a muscle attachment to a movable part
Describe the sliding filament model
The sliding filament model is a model of a muscle cell and it includes the following structures: Sarcoplasmic Reticulum, Transverse tubules, and Myofibril (contains thick and thin myofilaments, actin and myosin). It also shows a Z-line disk, a Sarcolemma, a Sarcomere, and a nucleus. A myofibril is divided into sarcomeres. Each sarcomere is an individual contractile unit.