Book lung are respiratory organs of phylum  

Larynx opens into pharynx by 

The number of lobes in the right and left lung of a man are  

Thyroid cartilage is found in  

Anaerobic respiration in animals, produces  

The exchange of gases in the alveoli of the lungs, takes place by  

Respiratory pigment or oxygen carrier in frog’s blood is 

Respiration is performed by the intestines in  

Blood analysis of a patient revealed an unusually high carboxyhemoglobin content. The patient has been inhaling polluted air containing unusually high content of   

The state, during which the respiratory centre is inhibited, is termed as