Muscle Tissue Flashcards
What is the main function of muscle tissue?
produce movement
What germ layer is all muscle derived from?
mesoderm
What are the muscle’s contractile proteins?
actin and myosin
What is the cell membrane of muscle cells called?
sarcolemma
What are the three types of muscle tissue?
skeletal, smooth, cardiac
What are the functions of skeletal muscle?
voluntary movement, facial expression, generating heat
Which type of muscle has no striations (no myofibril organization)?
smooth muscle
Which is the only type of muscle that is voluntary?
skeletal muscle
What is the function of smooth muscle?
to move materials thru the organ
Where do we find smooth muscle?
viscera (lining of body cavities, walls of blood vessels, walls of hollow organs), many tracts
Where do we find smooth muscle arranged in two directions?
GI tract (bowel)
Which type of muscle has the INABILITY to renew?
cardiac muscle
What is the purpose of intercalated discs?
joining of muscle cells, coordinated contraction of muscle, made of junctions
What are the three types of junctions that make up intercalated discs?
fascia adherens junctions (anchors thin filaments), expanded desmosomes (connection), and gap junctions (facilitates electrical communication)
What is heart muscle called?
myocardium
