3.2 - Skeletal Muscle Flashcards
What % of the body weight do the skeletal muscles make up?
around 40%
What is the function of the skeletal muscles?
to position and move the skeleton
Muscles are attached to bones via _____
tendons
What are tendons composed of?
dense regular connective tissue = collagen
What is collagen?
protein arranged into cable-like fibers
What is the outer connective tissue surrounding the whole skeletal muscle?
epimysium
What are fascicles?
bundles of muscle tissue
Fascicles are covered by a connective tissue sheath called _____
perimysium
What are muscle fibers covered by?
endomysium
What are myofibrils?
functional units of skeletal muscle, contractile and elastic protein bundles
What is the shape of a muscle fiber?
long and cylindrical
The cell membrane of a muscle fiber is called the ____
sarcolemma
The specialized endoplasmic reticulum of the muscle fiber is called _____
sarcoplasmic reticulum
What are T-tubules?
transverse tubules
branching tubes associated with the SR
What is the function of the terminal cisternae?
sequester Ca2+ with the help of Ca2+ ATPase in SR membrane
What is a triad?
1 t-tubules with flanking cisternae