Questions: After teaching a group of students about blood pressure and Korotkoff's sounds, the instructor determines that the teaching was successful when the students identify which of the following? Phase II sounds appear muffled and swishing. Phase V reflects the systolic pressure. Phase IV sounds are clear and repetitive. Phase I reflects the diastolic pressure.

The answer is the first one: Phase II sounds appear muffled and swishing.

Explanation for each option:

1. Phase II sounds appear muffled and swishing.
   This is correct. During a blood pressure measurement, Korotkoff sounds are used to identify different phases. Phase II is characterized by a muffled and swishing sound as the blood flow becomes more turbulent.

2. Phase V reflects the systolic pressure.
   This is incorrect. Phase V is actually the point where the sounds disappear, which is used to determine the diastolic pressure, not the systolic pressure.

3. Phase IV sounds are clear and repetitive.
   This is incorrect. Phase IV is characterized by sounds that are muffled and soft, not clear and repetitive. The sounds become less distinct as the cuff pressure approaches the diastolic pressure.

4. Phase I reflects the diastolic pressure.
   This is incorrect. Phase I is the point where the first tapping sound is heard, which indicates the systolic pressure, not the diastolic pressure.

In summary, the correct identification is that Phase II sounds appear muffled and swishing.