Which suffix relates to the act of coughing?

The suffix that relates to the act of coughing is indeed -tussie. This suffix originates from the Latin word "tussis," which translates to cough. It is commonly used in medical terminology to form terms associated with coughing or conditions that involve a cough, such as "pertussis," which refers to whooping cough. Understanding the etymology and usage of this suffix helps in identifying various respiratory-related terms in medical contexts.

The other suffixes can denote different bodily functions or conditions, which may not pertain to coughing directly. For instance, -pnea relates to breathing, -phagia pertains to eating or swallowing, and -tension refers to pressure, particularly in the context of arteries or muscles. Each suffix has distinct meanings that are crucial for accurately interpreting medical terms.