Answer:
The correct answer is - 20.
Step-by-step explanation:
Respiratory rate is the number of total breaths that occur in a minute. The breathing includes respiratory movements of expansion and contraction of the thoracic cavity or chest cavity.
The calculation of the respiratory at rest can be performed by counting the total number of rising or falling of the chest in a minute. The normal range of respiratory of a healthy adult is between 16 to 20 per minute however it depends on factors like age, medical conditions. Above 25 breaths per minute is considered as elevated respiratory.