HBHD I Chapter 9

We are able to maintain our body position because of a specialized type of skeletal muscle contraction called __________ __________.

Of all the muscles contracting simultaneously, the one mainly responsible for producing a particular movement is called the __________ __________ for that movement.

In most cases, isotonic contraction of muscle produces movement at a/an:

• insertion

• beginning

• joint

• bursa

Twitch contractions easily can be seen:

• in isolated muscles prepared for research

• in a great deal of typical muscle activity

• during resting periods

• in hyperkalemia

When oxygen supplies run low, muscle cells produce ATP and other waste products during contraction.

• True

• False

Unscramble the word: NFOXLIE

_________ is an autoimmune disease in which the immune system attacks muscle cells at the neuromuscular junction.

• Muscular dystrophy

• Myasthenia gravis

Unscramble the word: IORNIG

The minimal level of stimulation required to cause a fiber to contract is called the threshold stimulus.

• True

• False

Prolonged inactivity causes muscles to shrink in mass, a condition called:

• hypertrophy

• disuse atrophy

• paralysis

• muscle fatigue