Final answer:
Gas is infused into the abdominal cavity during laparoscopic surgeries using a Veress needle or trocar; it is not done through the mouth, nose, anus, or urethra.
Step-by-step explanation:
Gas is infused into the abdominal cavity through an incision in the abdominal wall, not natural orifices. This process is known as insufflation and is commonly used during laparoscopic surgeries to create a working space within the abdomen. The equipment used for this purpose is called a Veress needle or a trocar, through which carbon dioxide (CO2) gas is typically infused to inflate the abdomen. The mouth, nose, anus, and urethra are not involved in this process.