040-444

040-444 practice questions, page 10 of 15, with answer review and explanations.

Question 46

Fast-twitch muscle fibers have which of the following characteristics compared with slow twitch muscle fibers?

  1. Easily fatigued and well-developed aerobic system.
  2. High force production and well-developed blood supply.
  3. High PCr stores and high ATPase stores.
  4. None of the above.

Question 47

The motor neuron and all the muscle fibers it innervates are called a __________.

  1. Motor junction.
  2. Motor unit.
  3. Motor end plate.
  4. None of the above.

Question 48

The three principal mechanisms for increasing venous return during dynamic exercise are __________.

  1. A decrease in SV, HR, and compliance of the vascular system.
  2. Venoconstriction, pumping action of muscle, and the pumping action of the respiratory system.
  3. An increase in vascular resistance, increase in HR, and decrease in blood pressure.
  4. None of the above.

Question 49

Any physical activity with a performance time of approximately 30 seconds or less relies on which of the following energy systems?

  1. ATP.
  2. PCr.
  3. ATP-PCr.
  4. Aerobic glycolysis.

Question 50

Which of the following is NOT a muscle type?

  1. Skeletal.
  2. Smooth.
  3. Cardiac.
  4. Generic.