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?
â¢ Earth takes about 24 hours to rotate around its axis once.â¢ When a place on Earth faces the sun, it has daytime. When it faces away from the sun, it has night. 1. Relate Cause and Effect Explain how the motion of Earth causes day and night. (contd.). TEKS 5.8C: Demonstrate that Earth rotates on its axis once approximately every 24 hours causing the day/night cycle and the apparent movement of the Sun across the sky. â¢ Earth rotates from west to east.â¢ As Earth turns, the sun appears to move west across the sky. (contd.). TEKS 5.8C: Demonstrate that Earth rotates on its axis once approximately every 24 hours causing the day/night cycle and the apparent movement of the Sun across the sky.