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?
If you divide 24 hours by 365 days, youâll see that youâre left with about 4 minutes per day. In other words, the Earth rotates on its axis, but itâs also orbiting around the Sun, so the Sunâs position in the sky catches up by 4 minutes each day. The amount of time it takes for the Earth to turn once on its axis is known as a sidereal day â which is 23.9344696 hours.