The Muscular System Flashcards
Muscular System
the driving force, the power behind movement, is muscle tissue
Three kinds of muscle tissue:
Skeletal, Cardiac, Smooth
They differ from one another in their microscopic anatomy, location, and control by the nervous and endocrine system
contractility
the basic physiological property of muscle tissue: the ability to contract or shorten
excitability (or irritability)
the capacity to receive and respond to a stimulus
extensibility
the ability to be stretched
elasticity
the ability to return to original shape after being stretched or contracted
Skeletal tissue
attached primarily to bones, and it moves parts of the skeleton
striated because altering light and dark bands are visible when the tissue is examined under a microscope
voluntary muscle because it can be made to contract and relax by conscious control
striations
produced by a characteristic arrangement of contractile proteins, myosin and actin
epimsium
sheath of connective tissue surrounding the muscle
fascicle
a small bundle or cluster of muscle fibers
perimysium
sheath of connective tissue surrounding each fascicle
muscle fiber
muscle cell
sarcolemma
plasma membrane of a muscle cell (fiber)
myofibril
threadlike structure, running longitudinally through a muscle fiber consisting of thick filaments (myosin) and thin filaments (actin, troponin and tropomyosin) (myofilaments) which are arranged in sacromeres
sacromere
basic contractile unit of striated muscle fibers