ANATOMY

Detailed explanation-1: -During digestion, large food particles are converted into smaller components that are entirely different and can be readily absorbed into the bloodstream. The chemical composition of the substance changes and there is a formation of a new substance.

Detailed explanation-2: -Physical changes are changes in the physical properties of substances. No new substances are formed in these changes. These changes may be reversible.

Detailed explanation-3: -Food is chemically changed in digestion when new, smaller substances are formed. These chemical changes are examples of chemical digestion. Chemical digestion begins in the mouth when enzymes in saliva begin to break down carbohydrates. Most chemical changes in digestion occur in the small intestine.

Detailed explanation-4: -In physical digestion, your body mechanically breaks down food, grinding or smashing it into smaller pieces. However, during chemical digestion, enzymes, or tiny proteins, alter the structure of the food, which is made up of lots of atoms linked together.