On the cellular level:
Because the cell is longer, there needs to be multiple nuclei to make sure everything runs smoothly. There are also many mitochondria to keep up with the levels of activity and ATP requirements. It is helpful to have the cells longer and striated so that it is easier to connect to the bones.
On tissue level:
For skeletal muscles which we are focusing on, the actin filaments slide inwards between the myosin filaments. Mitochondria provide the energy for this to take place. This action causes a shortening of the sacromeres (Z-lines move closer together), which in turn causes the whole muscle fiber to contract. This can bring about a shortening of the entire muscle such as the biceps, depending on the number of muscles fibers that were stimulated. The contraction of skeletal muscle tissue is very quick and forceful.
On organ level:
The muscles then contract and relax to move the corresponding bone.
Because the cell is longer, there needs to be multiple nuclei to make sure everything runs smoothly. There are also many mitochondria to keep up with the levels of activity and ATP requirements. It is helpful to have the cells longer and striated so that it is easier to connect to the bones.
On tissue level:
For skeletal muscles which we are focusing on, the actin filaments slide inwards between the myosin filaments. Mitochondria provide the energy for this to take place. This action causes a shortening of the sacromeres (Z-lines move closer together), which in turn causes the whole muscle fiber to contract. This can bring about a shortening of the entire muscle such as the biceps, depending on the number of muscles fibers that were stimulated. The contraction of skeletal muscle tissue is very quick and forceful.
On organ level:
The muscles then contract and relax to move the corresponding bone.