During the refractory period, a muscle is unable to respond to stimuli temporarily.

During contraction, the length of myofibrils shrink.

During contraction, the Z discs become closer.

This question contains two parts.  You must answer both parts to receive full credit.   1) Describe a muscle twitch. Consider both how a twitch is generated and also how it used by the muscle.   2) Describe a graded response.  Consider both how it is generated and also how it used by the muscle. In your description, be sure to indicate how it is different than a muscle twitch.

Figure 9.2 Using Figure 9.2, match the following names to the correct letter (You may use an answer more than once):

This question contains two parts.  You must answer both parts to receive full credit.   1) Describe a muscle twitch. Consider both how a twitch is generated and also how it used by the muscle.   2) Describe a graded response.  Consider both how it is generated and also how it used by the muscle. In your description, be sure to indicate how it is different than a muscle twitch.

Smooth muscle fibers have only one nucleus and no sarcomeres.

Excess postexercise oxygen consumption refers to a muscle fiber’s need to ___________ after vigorous exercise.

Match the following terms to the correct definition (you may use an answer more than once):

Match the following terms to the correct definition (you may use an answer more than once):