ЛЕКЦИЯ № 41. The act of swallowing

The act of swallowing is divided into three stages. The first stage is under voluntary control. The food which has been transformed into a soft, mass by [...]

ЛЕКЦИЯ № 40. Sources of energy

The fuels of the body are carbohydrates, fats and proteins. These are taken in the diet. Carbohydrates are the principal source of energy in most diets. [...]

ЛЕКЦИЯ № 39. The progess of digestion

The process of digestion begins when food is taken into the mouth. Chewing Ы-еаго the food into smaller pieces, thereby exposing more surfaces to [...]