The skeletal and muscular systems are examples of important systems in the body with various functions. The skeletal system can be described as the body framework on which the human body is built (Turley, 2011)
As the muscles increase in size, the bones must also get bigger in order to support the bigger muscles. The failure in increase of the size of muscles could contribute to breakage or collapse of bones (Washington, 2010)
Myasthenia gravis disrupts the normal cycle of a muscle contraction and causes muscle fatigue or weakness. As a result of this illness antibodies are produced that end up binding to the acetylcholine receptors, which ultimately causes the destruction of the receptor and eventually leads to a reduction in the number of available and functional receptors (Chabner, 2011)
Once -55mv is reached, the membrane is said to be at the threshold potential, the voltage by which most Na+ channels in the cell membrane would open. After the first Na+ channel opens, the cell becomes even more depolarized and Na+ ions move into the cell (Martini, Nath, & Bartholomew, 2011)
¶ … Muscular System The normal anatomy and physiology of a muscle determines its capability of formulating a contraction. The contraction of a muscle is dependent on the ability of a neuron to become excited through a process that includes a concentrated flow of sodium (Na+), potassium (K+), and calcium (Ca+) through the neuron and eventually into the muscle cell (Tortora & Derrickson, 2011)