Metabolism is a term referring to the overall processes by which energy is obtained by an organism. In man it begins with the digestion process, and ends with cellular respiration.
Food molecules are broken down into their monomer units through the digestive process. Carbohydrates are broken into glucose units. Glucose is taken in by cells and used in cellular respiration to produce ATP, which is the form of energy that cells use.
Cellular respiration involves three stages namely glycolysis , Krebs cycle and electron transport chain. From one molecule of glucose, the number of ATP molecules generated through cellular respiration is 36 to 38 molecules.
Crystalline silica is a natural compound in the earth's crust and is a basic component of sand and granite. Silicosis is an incurable disease of the lungs caused by breathing crystalline silica dust. This dust can cause scar tissue to form in the lungs.
Arteries always flow away from the heart versus veins which carry blood to the heart. Bronchi are part of the lungs and move air. Platelets are components of blood that are responsible for clotting the blood.
The tympanic cavity is an air chamber; it contains a chain of movable bones which transmit the vibrations of the tympanic membrane across the cavity to the middle ear.
