3. Research demonstrates that a load of approximately what...

3. Research demonstrates that a load of approximately what percentage of maximum, when lifted explosively, can recruit all the motor units?

1.  15%
2.  33%
3.  65%
4.  70%

5. An isometric action occurs when the pulling force

1.  is less than the resistance force, and the muscle lengthens.
2.  equals the opposing force, and the muscleâs length increases.
3.  equals the opposing force, and the muscleâs length remains constant.
4.  is greater than the force applied by resistance in the opposite direction.

6. After a bout of high-intensity resistance exercise, muscle protein breakdown is increased for approximately how long?

1.  30 minutes
2.  60 minutes
3.  2 hours
4.  4 hours

7. An increase in volume of glycogen and semifluid plasma is known as

1.  myofibrillar atrophy.
2.  myofibrillar hypertrophy.
3.  sarcoplasmic atrophy.
4.  sarcoplasmic hypertrophy.

8. Which muscle fiber type has the highest shortening velocity?

1.  Type I
2.  Type Ix
3.  Type IIa
4.  Type IIx