Which of the following events happen when air expelled from lungs
1. Ribs and sternum returned to original position
2. volume of thorax decreased
3. Diaphragm relaxed and arched upwards
4. All of the above

On an average, a healthy human breathes ______times/minute.
1. 70-72
2. 20-25
3. 12-16
4. 120-80

Which of the following factors will increase the breathing rate
(1)Acidity

(2)decrease in pH

(3)Blood pressure

(4)All of the above

Which of the following volume of air cannot be measured by respirometer?
(1)IRV

(2)ERV

(3)RV

(4)Both A and B

Which one is odd out regarding breathing rate
(1)heart beat rate

(2)B.M.R

(3)CO₂ concentration

(4)Body size

On an average, a human child breathes ______times/minute.
(1)70-72

(2)24-27

(3)12-16

(4)120-80

Volume of air which does not participate in gaseous exchange is
(1)Residual volume

(2)Dead space air

(3)Tidal volume

(4)Both A and B

Which of the following is true regarding breathing rate
(1)It’s minimum in Whale/Elephant

(2)It’s is maximum in shrew

(3)more in child than an adult

(4)All of these

The breathing rate of human embryo ______times/minute.
(1)70-72

(2)20-25

(3)12-16

(4)None of these