If the word root pnea refers to breathing, which of the following terms would mean difficulty breathing?

• A. Heteropnea
• B. Nullpnea
• C. Dyspnea
• D. Neopnea

Answer: (C)

Verified step by step guidance

1. Step 1: Understand the meaning of the word root 'pnea', which refers to 'breathing'. This root is commonly used in medical terms related to breathing conditions.
2. Step 2: Recognize that prefixes modify the meaning of the root word. For example, 'dy-' is a prefix meaning 'difficult' or 'bad'.
3. Step 3: Analyze each option by breaking down the prefix and the root 'pnea':
4. - 'Heteropnea': 'hetero-' means 'different', so this would mean 'different breathing'.
5. - 'Nullpnea': 'null-' means 'none' or 'no', so this would mean 'no breathing'.
6. - 'Dyspnea': 'dys-' (often shortened to 'dy-') means 'difficult' or 'bad', so this means 'difficulty breathing'.
7. - 'Neopnea': 'neo-' means 'new', so this would mean 'new breathing'.
8. Step 4: Conclude that the term meaning 'difficulty breathing' is formed by combining the prefix 'dy-' (difficult) with the root 'pnea' (breathing), resulting in 'dyspnea'.