anatomy chapter 8
fascicles
Bundles of skeletal muscle cells are called...
Skeletal, cardiac, smooth muscle cells
List three types of contractile cells of the body.
Thin, thick
Perpendicular to the myofilaments are the Z lines and the M lines. The Z lines connect to ........filaments and the M lines connect to the.......filaments
Epimysium; perimysium
The connective tissue that immediately surrounds the muscle is called......and the connective tissue around the fascicles is called....
Sacromere
The region of the myofibril between two Z lines that is the contractile unit of a muscle cell is called a....
Thin filament and thick filaments
What are the names for the two types of filament in a myofibril?
The organized arrangement of contractile proteins called thick and thin filaments
What creates the skeletal muscle cells strained appearance?
To electrically insulate muscle cells from one another
What is the function of endomysium?
Movement of the body
What is the main function of skeletal muscles?
Tendon
What is the name of the structure that attaches skeletal muscles to bones?
triad
a group of one T tubule lying between two adjacent terminal cisternae
z line
a protein disk within the i band that anchors the thin filaments and connects adjacent myofibrils
muscle fibers
alternative name for skeletal muscle cells
A band
contains both thick and thin filaments
H zone
contains only thick filaments
I band
contains only thin filaments
myofibril
contains the contractile filaments withing the skeletal muscle cell
nucleus
contains the genetic material
a bands
dark areas that correspond to the areas where thick filaments are present
sarcoplasmic reticulum
interconnecting tubules of endoplasmic reticulum that surround each myofibril
T tubule
invaginations of the sarcolemma that projecting deep into the cell
i bands
light areas that contains only thin filaments
h zone
located in the middle of each a band, this lighter stripe appears corresponding to the region between the thin filaments
sarcolemma
plasma membrane of the muscle cell
m line
protein fibers that connect neighboring thick filaments
terminal cisternae
sac-like regions of the sarcoplasmic reticulum that contain calcium ions
mitochondria
sites of ATP synthesis
sacromere
the region of the myofibril between two z lines
