MEDICAL
RECTUM AND ANUS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Physical change
|
|
|
Chemical change
|
|
|
Either A or B
|
|
|
None of the above
|
Detailed explanation-1: -During the process of digestion, the food is broken down into smaller molecules. The salivary glands present in our mouth help in the breakdown of the food. In this process, there is a formation of a new substance. Therefore, it is considered to be a chemical change.
Detailed explanation-2: -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. Hence, digestion of food is a chemical change.
Detailed explanation-3: -Mechanical digestion in the oral cavity consists of grinding of food into smaller pieces by the teeth, a process called mastication. Chemical digestion in the mouth is minor but consists of salivary amylase (ptyalin, or alpha-amylase) and lingual lipase, both contained in the saliva.