Air Ventilation Lab Report

Pressure difference between area of high pressure and low pressure causes the air to flow. Air moves faster as the difference in pressure is getting bigger. So, breathing air into the lungs needs lower pressure at the lungs than in the air outside of body. To exhale, compared to the air we are breathing, the pressure at the lungs should be higher. In order to enlarge the chest cavity when inhalation occurs, the muscles between the ribs and diaphragm contract. The motion of inhalation causes the diaphragm to flatten and move downwards. The muscles between ribs move the rib cage upwards at the same time. Increases of the space for the lungs cause the drop of internal air pressure. So, air from the outside, which has higher pressure than inside the thorax, flows into the lungs to make the pressure same. As we breathe out, the diaphragm and muscles between ribs relax and return to their stabilized conditions. Therefore, by the resulted decrease in the size of thoracic
This occurs as the expiratory muscles receives the impulses that the expiratory center sends, speeding up the rate of the process. Also, the decrease in blood pH that occurs when blood acidity increases, causes the CO2 to increase in blood due to breathing. This change of acidity of the blood is detected by chemoreceptors. Respiratory muscles, the muscles that increase the rate of ventilation receives the nerve impulses.

Through anaerobic or aerobic respiration, ATP, which acts as an energy source, is generated. Intensity of exercise is closely related with the respiratory. Respiration increases during exercise due to the metabolic requirements of the activated muscles. This is to allow the exchange of oxygen and CO2 in lungs. As seen Fig. 1, there is a steep increase in ventilation at the starting point of exercise.
This occurs by a greater volume at lower/higher intensities which is associated with an extra increase in breathing