Which of the following statements about respiratory system in human is/are true?
- It consists of Nostrils, Nasal chamber, Pharynx, Larynx, Trachea, Bronchia and Alveoli.
- Pulmonary ventilation by atmospheric air is drawn in and O2 rich alveolar air is released out.
- It helps to keep a stable pH within the body and maintain respiratory acidosis and respiratory alkalosis.
- Inspiration occurs if the pressure within the lungs is greater than the atmospheric pressure.