Flashcards in Chapter 11: Muscular System Deck (123)
3 types of muscular tissue
Characteristics of Muscles (5)
(elaine received constant contractions extensively)
responsiveness to what? (3)
-to chemical signals, stretch, & electrical charges
electrical change triggers a wave of excitation
shortens when stimulated
capable of being stretched
returns to original length after being stretched
striated VOLUNTARY muscle attached to one or more bones
Muscle cell =______
alternating light and dark transverse bands
What do tendons attach specifically?
muscle to bone matrix
connective tissue around muscle cells
connective tissue around muscle fascicles
connective tissue surrounding entire muscle
what is the purpose of collagen? (3)
returns muscle to resting length
protects muscles from excessive stretching
contributes to power output & muscle efficiency
plasma membrane of a muscle fiber
cytoplasm of a muscle fiber
long protein bundles that occupy the main portion of the sarcoplasma
what are the components of myofibrils?what do they store?
glycogen (provide energy for heightened exercise) & myoglobin (stores oxygen)
where are mitochondria packed in muscle fibers?
in spaces between myofibrils
stem cells that fuse to form each muscle fiber
sarcoplasmic reticulum (SR)
smooth ER that forms a network around each myofibril
what is the sarcoplasmic reticulum a reservoir for?
what activates the muscle contraction process?
dilated end sacs of SR which cross the muscle fiber from one side to the other
tubular infoldings of the sarcolemma that penetrate through the cell & emerge on the other side
a T tubule & two terminal cisterns
made of several hundred myosin (golf club)
fibrous actin of 2 intertwined stands