HSC EV Biology 2nd Paper 5th Chapter

HSC EV Biology 2nd Paper 5th Chapter Note. Human Physiology, Respiratory Process, and Respiration. Breathing (or respiration, or ventilation) is the process of moving air into and out of the lungs to facilitate gas exchange with the internal environment, mostly by bringing in oxygen and flushing out carbon dioxide. All aerobic creatures need oxygen for … Read more