A & P Chapter 10.2 - 10.3 notes
Identify the structure where ATP is produced.
1 (mitochondria)
Where are the myosin molecules located?
5
The region of the sarcomere containing the thick filaments is the
A band
The skeletal muscle complex known as the triad consists of
A transverse tubule and two terminal cisternae.
The protein that is found in the Z line of a sarcomere is called
Actinin
What physiological process occurs in the structure labeled "7" (T Tubules)?
Conduction of the action potential into the cell interior
Muscle fibers are directly surrounded by which thin layer of connective tissue?
Endomysium
The capillaries that wrap around each muscle fiber are located within the __________.
Endomysium
The delicate connective tissue that surrounds the skeletal muscle fibers and ties adjacent muscle fibers together is the
Endomysium
The dense layer of connective tissue that surrounds an entire skeletal muscle is the
Epimysium
The area in the center of the A band that contains no thin filaments is the
H band
Muscle fibers differ from "typical cells" in that muscle fibers
Have many nuclei
Each skeletal muscle fiber contains ________ myofibrils.
Hundreds to thousands
The region of the sarcomere that always contains thin filaments is the
I band
Interactions between actin and myosin filaments of the sarcomere are responsible for
Muscle contraction
Which of the following best describes the term titin?
Protein that accounts for elasticity of resting muscle
The plasma membrane of a skeletal muscle fiber is called the
Sarcolemma
The repeating unit of a skeletal muscle fiber is the
Sarcomere
Stem cells located between the endomysium and sarcolemma that function in the repair of damaged muscle tissue are called
Satellite cells
Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber
Shortens
The structural theory that explains how a muscle fiber contracts is called the ________ theory.
Sliding filament
Which of the following best describes the term sarcoplasmic reticulum?
Storage and release site for calcium ions
At each end of the muscle, the collagen fibers of the epimysium, perimysium, and endomysium, come together to form a
Tendon
Which region of the sarcomere gives rise to the structure (band or line) indicated by the arrow (Z Line)?
The boundary between adjacent sarcomeres
Which region of the sarcomere gives rise to the structure (band or line) indicated by the arrow (M Line)?
The point of connection for adjacent tails of the thick filaments
Which region of the sarcomere gives rise to the structure (band or line) indicated by the arrow (H Band)?
The region of the resting sarcomere that only contains thick filaments
Which region of the sarcomere gives rise to the structure (band or line) indicated by the arrow (I Band)?
The region of the sarcomere that contains only thin filaments
Which of the following best describes the term Z line?
Thin filaments are anchored here
When a skeletal muscle fiber contracts, the
Zones of overlap get larger
