The thymus is positioned in the upper chest cavity above the heart. Thymus. The thymus gland is the main organ of the lymphatic system. Located in the upper chest region, the primary function of this gland is to promote the development of specific cells of the immune system called T lymphocytes. T lymphocytes or T-cells are white blood cells that protect against foreign organisms (bacteria and viruses) that have managed to infect body cells.
How long does it take for the Earth to rotate on its own axis ? The time it takes the Earth to rotate once is called a day (24 hours). The actual rotation time is a little less, about 23 hours and 56 minutes. Why do we have Day and Night?
Tagged as. The earth rotates on its axis and one full rotation takes 24 hours to complete. Weâd be very surprised if you didnât already know that, but what you may not know is that the speed of the earthâs rotation can change from day to day and year to year. So a true solar day is not exactly 24 hours, but the variations are a matter of seconds.