Both fats and muscles are organic compounds of different constituents and also storehouses of energy. Muscles tissues aid the function to contract in response to a stimulus from the nervous system. Fats provide an efficient concentrated source of energy for the cells. Fat supplies the energy when the body fails to get energy from the regular sources to carry out metabolism or the life-sustaining processes.
Muscles are made of proteins that are the main ingredients of cells. The primary unit of muscle is myofibril (a minute, threadlike structure made of complex proteins like myosin and actin). On the other hand, fats and oils (also called triglycerides or esters) are formed, along with water, following reaction of acids and alcohols. An atom of fat comprises of three molecules of fatty acids and one molecule of glycerol (alcohol).
Muscles and fats release varying amount of energy. The oxidation of a gram of protein or carbohydrate yields only 4100 calories whereas that of a gram of typical fat releases 9300 calories of energy.
Fats: The human body naturally stores the required fat tissues around joints and organs as well as under the skin. Fats act as a shield providing protection through insulation to the internal organs. But excess amount of fats is always harmful whereas extra muscles are helpful. However, superfluous fat gets accumulated at various other parts of the body which are actually not its storing locations like the waist, thighs, around the armpits or even at crucial internal parts. For instance it can get accumulated at the arteries clogging those passages of oxygenated blood to the vital organs thereby causing health complicacies. Fats also stiffen the cells as they form a semisolid mixture with water.
Muscles: Accounting for more than 50 percent of the dry weight of animals, these organic compounds were discovered in 1838. The root of the word ‘protein’ is the Greek term ‘proteios’, or primary.
There are three types of muscular tissues: skeletal, cardiac, and smooth.
The skeletal muscle activates the voluntary movement of bones. It comprises closely packed groups of muscle fibers (elongated cells). The alternation of thick and thin myofilaments gives them a striated or striped appearance. The cardiac muscle, located in the heart, pushes blood through the circulatory system. Cardiac muscle cells are joined to each other via the ‘intercalated disks’ which are specialized junctions. The cardiac muscles need a constant supply of oxygen, failing which it will die.
Actually, heart attacks occur if there is paucity of blood supply to the cardiac muscles and the resultant damage caused thereof. The smooth muscle – slender, spindle-shaped cells, each with a single nucleus – contracts in rhythmic waves to propel food through the digestive tract. It provides tension in the internal organs like uterus, blood vessels, and the urinary bladder among others.