Muscle System Test

Front

With Muscular Dystrophy:

Back

muscle fibers degenerate and atrophy

Front

Which of the following is not a usual result of exercise?
- increase in the efficiency of the respiratory system
- increase in the number of muscle cells
- increase in the efficiency of the circulatory system
- increase in the number of myofibrils within the muscle cells
- all of these occur as a result of exercise

Back

increase in the number of muscle cells

Front

An elaborate network of membranes in the skeletal muscle cells that functions in calcium storage is the:

Back

sarcoplasmic reticulum

Front

A sarcomere is:

Back

the area between two Z lines

Front

The major function of the sarcoplasmic reticulum in muscle contraction is to:

Back

regulate intracellular calcium concentration

Front

The striations of skeletal muscle are produced, for the most part, by:

Back

the arrangement of myofilaments

Front

Which of the following are composed of myosin? thin filaments, thick filaments , all myofibrils , Z lines , I bands

Back

thick filaments

Front

Which of the following surrounds an individual muscle cell? perimysium, epimysium, endomysium, fascicle, tendon sheath

Back

endomysium

Front

Rigor mortis occurs because:

Back

ATP is required to release the attached actin and myosin molecules

Front

One functional unit of a skeletal muscle is: a muscle fiber, the sarcoplasmic reticulum, a myofilament, a myofibril, a sarcomere

Back

a sarcomere