Multiple choice

Which of the following is the unit of respiration rate?

  1. Number of breaths per day

  2. Number of breaths per second

  3. Number of breaths per hour

  4. Number of breaths per minute

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Respiration rate is number of breaths per minute. Normal breathing rate for humans is 12-20 breaths per minute.