The correct answer is D. Contractions.
Striated and cardiac cells are both types of muscle cells. Muscle cells are specialized cells that contract, or shorten, in order to produce movement. Striated and cardiac cells are both striated, which means that they have alternating light and dark bands that run across the cell. These bands are caused by the arrangement of the proteins actin and myosin, which are responsible for muscle contraction.
Striated cells are found in skeletal muscles, which are the muscles that we use for voluntary movement. Cardiac cells are found in the heart, which is a muscle that pumps blood throughout the body. Both striated and cardiac cells are able to contract in response to electrical signals. These signals are generated by the nervous system and travel down the nerves to the muscles. When the signals reach the muscles, they cause the release of calcium ions, which trigger the contraction of the muscle fibers.
The contractions of striated and cardiac cells are essential for movement and for the circulation of blood, respectively. These contractions are controlled by the nervous system and are essential for life.
A. Shape: Striated cells are long and thin, while cardiac cells are short and branched.
B. Number: Striated cells are much more numerous than cardiac cells.
C. Striations: Striated cells have alternating light and dark bands that run across the cell, while cardiac cells do not.