Fibrovascular polyp of the esophagus. â Even rarer than the above two, it occurs as a large mass of connective tissue, blood vessels and fat enclosed in a sheath of epithelial cells. It is suspended by a stalk from the wall of the tube discussed. It can be up to 50 cm long and occurs in the upper third of the tube.he polyps are smooth, round and grow from the wall of the esophagus. It is rarely cancerous and can be removed by an endoscopic procedure. Patients mostly donât report symptoms from these. However, some may complain of chest pain and dysphagia.
A simple circuit requires three (3) things: 1  A source of electrical potential difference or voltage. 2  A conductive path which would allow for the movement of charges. 3  An electrical resistance (resistor) which is loosely defined as any object that uses electricity to do work. simple circuit requires three (3) things: 1  A source of electrical potential difference or voltage. 2  A conductive path which would allow for the movement of charges. 3  An electrical resistance (resistor) which is loosely defined as any object that uses electricity to do work.
The current source is usually less common in circuits than the voltage source, but both are used and can be regarded as complements of each other. An electrical supply or simply, âa sourceâ, is a device that supplies electrical power to a circuit in the form of a voltage source or a current source.