Ch 9 Flashcards
What is the general function of skeletal muscles?
attach to bones and skin of face
Voluntary or involuntary?
voluntary
What 4 things are skeletal muscles composed of?
- skeletal muscle tissue
- nervous tissue
- blood
- connective tissue
Covers each muscle:
fascia
Attach muscle to bone:
tendons
Sheets that connect muscle in trunk and head:
aponeuroses
(muscle covering) Surrounds whole muscle:
epimysium
(muscle covering) Surrounds fascicles within a muscle:
perimysium
(muscle covering) Surrounds muscle fibers within a fascicle:
endomysium
List the 5 connective tissue covering things from biggest to smallest.
Muscle——> Fascicles—–> Muscle fibers (cells)—–> Myofibrils—–> Thick and thin filaments
Structures containing the contractile proteins actin and myosin:
thick and thin filaments
Overlapping parallel groups of thick and thin filaments in a repeating pattern; the underlying basis for the striation pattern:
myofibril
A single muscle cell, multinucleate and may be many centimeters long:
muscle fiber
A bundle of muscle fibers within a muscle:
fascicle
A bundle of fascicles:
muscle
Where are thick and thin filaments located?
intracellular
Where are myofibrils located?
intracellular
Where are muscle fibers located?
in a muscle, surrounded by endomysium
Where are fascicles located?
in a muscle, surrounded by perimysium
Where are muscles located?
surrounded by epimysium
Skeletal muscle fibers=
muscle cell
What kind of nucleus do muscle fibers have?
multinucleated
(skeletal muscle fibers) Sarcolemma:
membrane
(skeletal muscle fibers) Sarcoplasm:
cytoplasm
(skeletal muscle fibers) Sarcomeres:
contractile unites
(skeletal muscle fibers) Sarcoplasmic reticulum:
specialized ER and stores calcium ions
(skeletal muscle fibers) Transverse tubule:
sarcolemma goes deep into muscle fibers
(skeletal muscle fibers) Triad:
1 T tubule and 2 SR cisternae
What do skeletal muscle fibers contain a lot of?
myofibrils
What 2 things do myofibrils consist of?
- thin actin filament
- thick myosin filaments
