What is the concentration of oxygen in expired air?

External nostrils → vestibules → nasal chambers → internal nares → naso pharynx → X → lary…

Formation of oxyhaemoglobin is a/an ____

Diaphragm increases volume of thoracic cavity in _____

Which organism classification can breathe through moist skin?

What percentage of carbon dioxide transport in the form of carbamino haemoglobin?

Contraction in diaphgram causes increase in thoracic volume in the _____

Tracheal tubes are present for which type of organisms?