He has a SAC rate of 25 litres per minute. 1  Work out how much air is available-Remove and ignore 50 BAR from the cylinder calculations. 2  i.e., 220 (BAR) - 50 = 170 BAR. 3  In a 12 litre cylinder this would give 2,040 litres.e has a SAC rate of 25 litres per minute. 1  Work out how much air is available-Remove and ignore 50 BAR from the cylinder calculations. 2  At 25m (3.5 BAR) his breathing rate will be 3.5 (BAR) x 25 (SAC) = 87.5 litres per minute. 3  How many 87.5 (litres per minute) will go into 2040 (his available air) = 23 Minutes.
Function of the Respiratory System. The function of the human respiratory system is to transport air into the lungs and to facilitate the diffusion of Oxygen into the blood stream.Its also receives waste Carbon Dioxide from the blood and exhales it.arts of the Upper Respiratory Tract. 1  Mouth, nose & nasal cavity: The function of this part of the system is to warm, filter and moisten the incoming air. 2  Pharynx: Here the throat divides into the trachea (wind pipe) and oesophagus (food pipe). 3  Larynx: This is also known as the voice box as it is where sound is generated.
The purpose of the respiratory system is to supply oxygen to body tissues and to remove carbon dioxide, which is a waste product, from the body tissues.