Final answer:
The correct term for the withdrawal of fluid using suction is aspiration, which is distinct from the terms related to breathing provided in the options such as external respiration and pulmonary ventilation.
Step-by-step explanation:
The withdrawal of fluid from a cavity or sac with an instrument using suction is called aspiration. Aspiration is a medical procedure that may be performed to remove pus, blood, or other fluids from a wound or body cavity.
It is important to note that whilse aspiration is the correct answer, the terms provided as options (external respiration, interpulmonary respiration, internal respiration, and pulmonary ventilation) all relate to the process of breathing.
External respiration is the exchange of gases between the environment and the blood within the lungs.
Interpulmonary respiration is not a commonly recognized term, but it could be interpreted as the gas exchange that occurs within the lungs.
Internal respiration refers to the exchange of gases between the blood and the body's cells in the systemic circulation. Lastly, pulmonary ventilation is the physical process of moving air in and out of the lungs during breathing.