Q.

From equipment point of view, the respiratory system in the human body is a                     system.

A. hydraulic
B. pneumatic
C. mechanical
D. electrical
Answer» B. pneumatic
Explanation: Respiratory system is a pneumatic system in which an air pump (diaphragm) alternately creates negative and positive pressures in a sealed chamber (thoracic cavity) and causes air to be sucked into and forced out of a pair of elastic bags (lungs). Blood circulatory system is related to hydraulic system.
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