Retrolisthesis can narrow the size of the spinal canal to allow spinal nerve irritation. The stress on the intervertebral disc as the backward movement of the vertebra occurs creates much stress on the disc which then causes back pain. (See the white arrow for retrolisthesis.) Examination.
Mitochondria provide cells their energy, and since muscle cells require more energy than skin cells, there is more mitochondria.itochondria is the part of cells that generate energy by turning nutrients and oxygen into fuel for the body. Muscle cells need this ability more because they are constantly â¦ working; fat cells do not need it as much.
Mitochondria are more numerous in cardiac muscle cells than in skeletal muscle, and the T-Tubules are continuous with the cell membrane. These carry action potentials into the cell interior and are well developed in the ventricles of the heart, but poorly developed in both atria.ike skeletal muscle, the SARCOMERE is the contractile unit of the myocardial cell. It contains myosin and actin filaments as well as troponin and tropomysin. Shortening of sarcomeres causes contraction by the sliding filament model already described.