15. Nervous system E. Write True or False 21. We need air to live and the air that gives us life is called oxygen. 22. The human Respiratory system performs this gas exchange need by body. 23. The air enters to your nose through your nostrils which is the opening into the nasal passage that is lined with hair that filters the dust and other particles in the air. 24. Lungs located in the chest cavity and surrounded by the ribcage is the main organ of the respiratory system where the exchange of gases occurs. 25. Diaphragm located at the bottom of the lungs is a dome-shaped muscle that controls breathing. 26. Nervous system is composed of the brain, spinal cord, and nerves 27. Brain is the master organ of the nervous system and has 4 major parts, erebrum, cerebellum, medulla oblongata and kidney. 28. Nerves is also called nerve cells or neurons, it transmits the messages from the erent parts of the body to the brain and vice versa. • 29. The nervous system, just like other body systems it needs to be taken care of a. Avoid smoking and drinking b. Have a positive outlook in life, no worries, etc. _30. The most important part of the nervous system is the heart. Pa help now naa magsagot lang may alam ​