The effect muscular dystrophy has on muscle tissue is...

• most cases are in females

• loss of fat and connective tissue decrease muscle size

• muscle fibers degenerate and atrophy

• it is not inherited for the most part

Which type of muscle cells regenerate the best?

• None of them regenerate

• cardiac

• smooth

• skeletal

An elaborate network of membranes in skeletal muscle cells that functions in calcium storage.

• intermediate filament network

• mitorchondria

• myofibrillar network

• sarcoplasmic reticulum

Immediately following the arrival of the stimulus at a skeletal muscle cell there is a short period called the _________ period during which the events of excitation-contraction coupling occur.

• contraction

• latent

• relaxation

• refractory

What is a sarcomere?

• the wavy lines on the cell seen in the microscope

• the nonfunctional unit of skeletal muscles

• the area between two intercalated discs

• the area between two Z lines

The striations of a skeletal muscle cell are produced, for the most part, by...

• the arrangement of myofilaments

• the T tubules

• the sarcoplasmic reticulum

• a difference in the thickness of the sarcolema

Which of the following are composed of myosin?

• all myofilaments

• thick filamentss

• Z discs

• thin filaments

What does aponeurosis refer to?

• a sheetlike indirect attachment to a skeletal element

• the bands of myofibrils

• the tropomyosin-troponin complex

• the rough endoplasmic reticulum

The contractile units of skeletal muscle are known as...

• mitochondria

• microtubules

• T tubules

• myofibrils

In an isotonic contraction, the muscle...

• rapidly resynthesizes creatine phosphate and ATP

• changes in length and moves the "load"

• never converts pyruvate to lactate

• does not change in length but increases tension