straight duct

This fluid travels from the coiled portion up through the straight duct (Figure 2).

What happens in the straight duct depends upon the rate of sweat production or flow:

-Low sweat production (rest, cool temperature) - Cells in the straight duct reabsorb most of the sodium and chlorine from the fluid.

There are also other interesting designs such as a design which incorporates a straight duct filter built-in with truncated cone shape cathode as reported by D. A. Karpov in the 90's.

When the sweat gland is stimulated, the cells secrete a fluid that travels from the coiled portion of the gland up through the straight duct and out onto the surface of our skin.

A design feature of the aircraft was the use of a straight duct air intake design for the vertical stabilizer (tail) mounted engine, similar in engineering design concept to a McDonnell Douglas DC-10, rather than the s-duct arrangement of most trijet aircraft designs such as the Dassault Falcon 900.