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?
The time it takes the Earth to rotate once is called a sidereal day. The actual rotation time is about 23 hours and 56 minutes.The mean solar day is longer, exactly 24 h â¦ ours, because of the distance the Earth moves in its orbit around the Sun.This orbital motion causes the small daily apparent motion of the Sun to the East in the sky.he time it takes the Earth to rotate once is called a sidereal day. The actual rotation time is about 23 hours and 56 minutes.