The below mentioned article provides a notes on gastrointestinal tract. Gastrointestinal tract can be described as a specialized tube communicating with the external environment both at its upper and lower ends. There is regional specialization suited for the local functions. The main functions of GIT are: 1. Secretion: Exocrine—enzymes; endocrine— hormones of GI tract 2. Motility 3. Absorption 4. Storage [...]
Liver has many functions. One of them is to secrete bile. The liver cells per day secrete about 600 to 1000 ml of bile. Bile secretion is a continuous process. Certain substances are actively secreted and certain other substances are passively transported. Water molecules follow the transported substances mechanism. Histology of Liver: Figure 5.22 shows basic histology of liver. Stages [...]
In this article we will discuss about the parts of human respiratory systems. Nose: a. Hairs are present in the nasal cavity. These hairs serve to filter the air that is entering the respiratory system. Any particle whose size is more than 6 µ gets filtered in the nose. b. The mucous membrane of the nose is highly vascular. As [...]