Answer the following statements true (T) or false (F)
1. The lifting of a 10-lb weight requires the activation of fewer motor units than the lifting of a 5-lb weight.
2. Twitch contractions play an important role in normal muscle activity.
3. Lifting your textbook off the desk is an example of an isotonic muscle contraction.
4. Trying to lift a car (and failing) is an example of an isotonic muscle contraction.
5. In an isometric contraction, no movement occurs but the muscle tension increases.
1. FALSE
2. FALSE
3. TRUE
4. FALSE
5. TRUE
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