In physiology, the term<unk>  or<unk> al<unk>  (originating from the Medieval Latin word<unk> , from Latin serum) is any of various body<unk> s resembling serum, that are typically pale yellow or transparent and of a benign nature. The<unk>  fills the inside of body cavities.<unk>  originates from<unk>  glands, with secretions enriched with proteins and water.<unk>  may also originate from mixed glands, which contain both mucous and<unk>  cells. A common trait of<unk> s is their role in assisting digestion, excretion, and respiration. In medical fields, especially cytopathology,<unk>  is a synonym for effusion<unk> s from various body cavities. Examples of effusion<unk>  are pleural effusion and pericardial effusion. There are many causes of effusions which include involvement of the cavity by cancer. Cancer in a<unk>  cavity is called a<unk>  carcinoma. Cytopathology evaluation is recommended to evaluate the causes of effusions in these cavities.
Serous fluid
Bloody show
Chyme
No blood, no foul
Transudate
Thrombus
Tubular fluid
Exudate