Anatomy 10-1 thru 10-3
Sarcomere is best defined as ___________
a repeating unit of striated muscle
Put the following structures in order from superficial to deep: 1. muscle fiber 2. perimysium 3. myofibril 4. fascicle 5. endomysium 6. epimysium
6, 2, 4, 5, 1, 3
Which statement about the microscopic anatomy of skeletal muscle fibers is true?
All Answers are true
The area in the center of the A band that contains no thin filaments is the
H Band
Which of these statements about skeletal muscles is false?
Which of these statements about skeletal muscles is false?
A fascicle is
a group of muscle fibers that are encased in the perimysium.
The skeletal muscle complex known as the triad consists of
a transverse tubule and two terminal cisternae.
Muscles are attached to bones by tendons or __________.
aponeuroses
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.
Muscle fibers differ from "typical cells" in that muscle fibers
have many nuclei.
Interactions between actin and myosin filaments of the sarcomere are responsible for
muscle contraction
Skeletal muscle fibers are formed from embryonic cells called
myoblasts.
Cross-bridges are portions of
myosin molecules.
A thin layer of connective tissue that surrounds a muscle fascicle is called the __________.
perimysium
Skeletal muscle does each of these except __________.
pump blood
Which of the following best describes the term sarcomere?
repeating unit of striated myofibrils
The plasma membrane of a skeletal muscle fiber is called the
sarcolemma.
The series of membranous channels that surround each myofibril is the
sarcoplasmic reticulum.
Since each myofibril is attached at either end of the muscle fiber, when sarcomeres shorten, the muscle fiber
shortens.
Which type of muscle tissue has the greatest effect on the body's heat production?
skeletal
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, and each perimysium and endomysium, come together to form a
tendon
The bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone is called a(n)
tendon
The advantage of having many nuclei in a skeletal muscle fiber is
the ability to produce large amounts of the muscle proteins needed for growth and repair.
Which of the following best describes the term Z line?
thin filaments are anchored here
At rest, active sites on the actin are blocked by
tropomyosin molecules.
