3 Mixed seromucous salivary glands, structure of glandular acini The three large glands have a different composition in the type of secretory units is concerned: - The parotid glands (which represent 25% of the production of saliva) are formed by serous production units and they are compound acinar type.
How Anti-Lock Brakes Work. An anti-lock brake system (ABS) is a braking system that is made to allow a vehicle to maintain traction with the road when braking. Braking is controlled by driver input via the brake pedal, and older braking systems response to a driver braking suddenly or with intense pressure was sometimes to lock up or skid.
Ë A trailer with anti-lock brakes (ABS or EBS) must have automatically adjusting brakes (which means either disc brakes, or drum brakes with automatic slack adjusters) As of 1st January, all new trailers must be fitted with either ABS or EBS brakes or a load proportioning brake system.