Rate of breathing in a newborn is about . . . . . . times per minute.

$A$ : The passage starting with the external nostrils up to the terminal bronchiole constitutes the respiratory part.
$R$ : The respiratory part transports the air to the alveoli,clears it from foreign materials,humidifies it,and brings the air to body temperature.

Respiration is the physiological process in which

Which of the following two changes occur in humans when they move to high altitudes (above $3,500 \ m$)?
$(1)$ Increase in red blood cell size
$(2)$ Increase in red blood cell production
$(3)$ Increase in breathing rate
$(4)$ Increase in thrombocyte count

Select the correct match.

$(1)$ $Cl^-$ translocation is required during the transport of $CO_2$.
$(2)$ The probability of lung cancer increases due to smoking.