The energy produced during cellular respiration is .

1. ADP
2. ADH
3. ATP
4. None of the above

The basic structural and functional unit of the lungs is :

1. Pleura
2. Alveolus
3. Capillary
4. Diaphragm

Which of the following is a respiratory pigment ?

1. Melanin
2. Haemoglobin
3. Chlorophyll
4. None of the above

The muscular sheet which divides the body cavity into thorax and abdomen is termed as :

1. Inner pleura
2. Rib cage
3. Outer pleura
4. Diaphragm