Question

Which of the following parts is excluded from the study of T.S. of the gut.
A. Pharynx
B. Oesophagus
C. Colon
D. Rectum

Answer 1

The human digestive system is also known as the human gut. It includes organs and glands extending from an anterior opening called mouth to the posterior opening known as anus.

Complete answer: The pharynx can be explained as the cavity or space behind the nasal cavity and mouth and is a part of the throat area. Even though it is a part of the throat region, it is primarily a part of the respiratory system and not the gut region. It is the conducting part of the respiratory system and is excluded from the study of T.S of the gut.
Considering the other given options:
-Oesophagus: A tubular organ that connects the throat to the stomach. It is a passageway for food. No digestion happens at this site. This organ also possesses the four different layers in the T.S as that of the whole gut.
-Colon: The last organ of the human digestive system is the large intestine. Colom is a part of the small intestine and makes up the majority portion of it. It helps mainly in the absorption of water. There are many beneficial microorganisms inhabiting the colon which helps in its normal healthy functioning. The lining is also made up of four layers.
-Rectum: This is the final part of the large intestine. It is the region where feces are formed and are stored till the process of defecation. This region also possesses four layers.
Thus from the above-given options, the most appropriate option is A, i.e., Pharynx is excluded from the study of T.S of the gut.

Note: The four layers present in the gut are Serosa, Muscularis, Submucosa, and mucosa. The serosa is the outermost tissue consisting of connective tissues, the muscularis is the second layer consisting of two sublayers of radial and longitudinal muscles, while submucosa and mucosa are the two innermost layers, where glands aiding the process of digestion are present.