How does the structure of the skeletal muscle it perform its function? its spindle-shaped cells allow it to do smooth movements. its striations allow for big movements. its nucleated cells allow it to trigger involuntary actions. its discs allow it to coordinate movement with other cells.

Its striations allow for big movements.

Explanation:

Muscle cells perform important functions in the living organisms. They perform the function of support, movements and controls the body coordination. Three different muscles are skeletal muscle, cardiac muscle and smooth muscle.

Skeletal muscles are attached to bones that involves in the entry and exit side of the body. The skeletal muscles shows striations and has many nuclei that allows the large movements of the body. These striations involves the sarcomere units that allows the body contraction.

Thus, the correct answer is option (2).

The right answer is Its striations allow for big movements.

*Skeletal muscle is by definition the muscle that, through the tendon, attaches to the skeleton and allows the movement of the skeleton in a well-defined direction thanks to its essential function of contraction. It has been described, with the first optical microscope observations on tissue in longitudinal section, as a tissue having both transverse and longitudinal striations. Muscle fibers are plurinucleate cells of polygonal shape whose nuclei are located at the periphery of the fiber, attached to the sarcoplasmic membrane. A skeletal muscle fiber is a true syncitium, ie a set of protoplasm fused together. The striated skeletal muscle fiber therefore has the functional characteristics of a giant cell (1-5 cm long, 10-100 μm in diameter).

*Skeletal muscle is a voluntary contraction muscle. Each of the fibers constituting it is a structural syncytium. The intensity of muscle contraction as a whole is a function of the number of motor units that have been activated.

the right is separation by density .

take the blood which is a good example of a heterogeneous mixture.

blood is a vital liquid in our body, which transports oxygen from the air to our lungs so we can breathe. it is also used to eject wastes, such as carbon dioxide, to bring cells and molecules of the immune system to the tissues, and to spread hormones throughout the body. it corresponds to plasma, red blood cells, white blood cells, platelets and hemoglobins combined.

in medical tests centrifugal force is used to separate the different components of the blood.

in general, the centrifugation will allow to separate and analyze the different components of the blood, to know if the rate of white blood cells in the blood of a patient, for example, is normal, and therefore to know if his system immune is integrity.

under the action of centrifugal force, the solid components in the blood are drawn to the bottom of the tube in which the blood is contained. the centrifugal force then acts as an accelerated settling. it separates plasma from red blood cells and white blood cells.