A&P Chapter 10

muscle fiber

surrounded by: endomysium contains: myofibrils

I band

the region of the sacromere that contains only thin filaments

The narrow space between the synaptic terminal and the muscle fiber is the M line.motor unit.synaptic knob.synaptic cleft.motor end plate.

.synaptic cleft

superficial fascia

a layer of connective tissue just beneath the skin that serves to connect to deeper tissues

Interactions between actin and myosin filaments of the sarcomere are responsible for a. muscle contraction. b. muscle fatigue. c. the striped appearance of skeletal muscle. d. the conduction of neural e. stimulation to the muscle fiber. e. muscle relaxation.

a. muscle contraction.

Muscle tissue, one of the four basic tissue groups, consists chiefly of cells that are highly specialized for a. conduction. b. contraction. c. peristalsis. d. cushioning. e. secretion.

b. contraction.

A fascicle is a a. layer of connective tissue that separates muscle from skin. b. group of muscle fibers that are encased in the perimysium. c. group of muscle fibers and motor neurons. d. group of muscle fibers that are all part of the same motor unit. e. collection of myofibrils in a muscle fiber.

b. group of muscle fibers that are encased in the perimysium.

Each thin filament consists of a. chains of myosin molecules. b. two actin protein strands coiled helically around each other. c. a rod-shaped structure with "heads" projecting from each end. d. six molecules coiled into a helical structure. e. a double strand of myosin molecules.

b. two actin protein strands coiled helically around each other.

sacromere

contains: thick filaments and thin filaments

Muscles are attached to bones by tendons or __________. a. perimysium b. ligaments c. superficial fascia d. aponeuroses

d. aponeuroses

A(n) ________ can be described as a broad tendinous sheet. a. tympanum b. retinaculum c. interstitium d. aponeurosis e. fasciae

d. aponeurosis

At each end of the muscle, the collagen fibers of the epimysium, perimysium, and endomysium, come together to form a a. satellite cell. b. ligament. c. tenosynovium. d. tendon. e. sheath.

d. tendon.

T tubules

distribute action potentials throughout the interior of the skeletal muscle cell

Which of the following is a recognized function of skeletal muscle? a. guard body entrances and exits b. maintain body temperature c. maintain posture d. produce movement e. All of the answers are correct.

e. All of the answers are correct.

The repeating unit of a skeletal muscle fiber is the a. sarcoplasmic reticulum. b. sarcolemma. c. myofilament. d. myofibril. e. sarcomere.

e. sarcomere.

Which of the following best describes the term Z line? a. protein that accounts for elasticity of resting muscle b. repeating unit of striated myofibrils c. storage site for calcium ions d. largely made of myosin molecules e. thin filaments are anchored here

e. thin filaments are anchored here

triad

function in storage of calcium

nuclei

houses the genetic material (DNA) of the cell

mitochondria

making of energy (ATP); "power house" of the cell

skeletal muscle

surrounded by: epimysium contains: muscle fascicles

muscle fascicle

surrounded by: perimysium contains: muscle fibers

myosfibril

surrounded by: sacroplasmic reticulum consists of: sacromeres (Z line to Z line)

Z line

the boundary between adjacent sacromeres

M line

the point of connection for adjacent tails of thick filaments

H band

the region of the resting sacromere that only contains thick filaments