These structures have been installed and operated for a number of reasons: 1  locks allow navigation on large rivers to facilitate boating traffic. 2  weirs create pool environments for diversion into irrigation channels, for pump intakes, recreational boating and swimming, and other aesthetic reasons.
Medical Definition of carbohydrate. : any of various neutral compounds of carbon, hydrogen, and oxygen (as sugars, starches, and celluloses) most of which are formed by green plants and which constitute a major class of animal foods.
Carbohydrates are present in food in the form of starch, sugar and fiber. A carbohydrate is a molecule containing carbon, oxygen and hydrogen, and can be either simple or complex. Both simple and complex carbohydrates can be healthy food options. Simple carbohydrates are monosaccharides and disaccharides.