HB Muscle Quiz

During muscle contraction, the myosin heads pull on the actin filaments, causing the actin to slide toward the center of the sarcomere.

• True
• False

The detachment of myosin heads from actin requires ATP.

• True
• False

A muscle (such as the lovely gluteus maximus) is made of bundles of fascicles, which are bundles of muscle fibers, which are bundles of myofibrils, which are arrangements of myofilaments.

• True
• False

Skeletal muscles are not very well supplied with nerves and blood vessels.

• True
• False

The marathon mouse has been genetically altered as an embryo to produce more mitochondria.

• True
• False

Which of the following is not a function of muscle tissue?

• Heat production
• Regulation of organ volume
• Vitamin D production
• Body movement and position

The pigment in the muscle fibers that stores oxygen is

• hemoglobin
• myoglobin
• melanin
• glycogen

Muscle tone is due to

• the contraction of muscle fibers in a whole muscle
• a small number of muscle units activated
• sustained muscle contraction
• all of these

Muscle fatigue can be caused by

• increased ADP
• insufficient oxygen
• depletion of creatin phosphate
• All of these

A sustained contraction of muscle is called

• tetanus
• summation
• latent period
• twitch