The immune system protects your body from sickness and germs. 2. Leukocytes are white blood cells that seek out and destroy organisms or substances that can cause disease. 3. Lymph nodes are glands that work like filters to remove germs.
The number of sets allowed per each team varies based upon the type of track and the length of the race. Each tire costs $449 each, and teams spend an average of $20,000 on tires for a single race. Tires lasts about 100 miles on a NASCAR track. They are 11.5 inches wide with a weight of 24 pounds each. Goodyear manufactures 18 different tires for NASCAR teams over an entire season.
If a driver evenly wore all four tires down to 2/32 of remaining tread depth in 30,000 miles, they would be offered a new set of equivalent tires from the same brand that would be discounted from their current retail price by 25% (prorating the value of 10,000 of the 40,000 miles of wear they didn't receive).