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.
What You Need to Know about ABS for School Buses. The antilock brake system (ABS) mandate has arrived. School buses (with a GVWR of more than 10,000 pounds) equipped with air brake systems manufactured after March 1 will be required to have ABS. On March 1, 1999, the same ABS requirement will be applied to new school buses with hydraulic brakes.