9. In the anaerobic sequence for the production of ATP, the ultimate product is lactic
acid. As this occurs, the muscle becomes stiffer and unable to function well. Before the
muscle can function well again, the muscle must be replenished with oxygen.
10. At the margins of a wound to a skeletal muscle, the healthy striated muscle fibers
dedifferentiate. The regenerating muscle fibers will actually join and produce a whole
muscle again, if there has been proper removal of damaged tissue and foreign materials
(debridement) and if the edges of the live muscle tissue are closely fitted to each other.
11. The potential secondary role of a skeletal muscle is important. First, it may mask
the fact that another muscle is not working properly. Second, when a muscle is known
to work improperly, another muscle's secondary role can be developed through
exercises so that it will perform the action of the first muscle. (para 5-18)
12. Some muscles are specially designed to maintain the erect posture of the human
The skeletal muscles of the rib cage and the abdominal cavity produce the various
muscular actions of breathing.
The muscles of the trunk wall increase the interior pressures of the trunk to assist
in evacuation of substances from the body and stabilize the trunk to act as a base for
work of the upper members.
There is also a muscular response used to immobilize an area of the body. This is
13. The general process in which muscle or another type of tissue decreases is called
atrophy. A muscle increases in mass through a process called hypertrophy.
An activity in which a muscle produces tension without a change in length is called
an isometric exercise. In isotonic exercises, the active muscles change in length.
14. The skeletal muscles of one side of the body are controlled by the opposite side of
the brain. Thus, injury to the left side of the brain tends to result in paralysis of the right
15. The last point where a stimulus can be applied to make a whole muscle contract is
the motor point. This is the point where the neurovascular bundle enters the muscle.
This bundle contains the NAVL for that muscle within a common FCT sheath.