What is the normal breathing rate in an adult human at rest?

In the lungs:
$(a)$ What substance is taken into the body?
$(b)$ What substance is removed from the body?

Describe the events that occur during the process of breathing in humans.

Which of the following statement$(s)$ is (are) true about respiration?
$(i)$ During inhalation,ribs move inward and diaphragm is raised
$(ii)$ In the alveoli,exchange of gases takes place i.e.,oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air
$(iii)$ Haemoglobin has greater affinity for carbon dioxide than oxygen
$(iv)$ Alveoli increase surface area for exchange of gases

Which gases are exchanged in your lungs?

An experiment is set up as shown. Flasks $1$ and $2$ contain lime water. Air is pumped through the flasks. What is the appearance of lime water in flasks $1$ and $2$ after a period of ten minutes?

Option	Flask $1$	Flask $2$
$(a)$	Clear	Clear
$(b)$	Clear	White/ Cloudy
$(c)$	White/ Cloudy	Clear
$(d)$	White/ Cloudy	White/ Cloudy