Carbonic anhydrase is present in

1.	R.B.C	2.	Plasma
3.	Both A and B	4.	Tissues

The CO_2­ is trapped in the form of ___________ at the tissue level.

(1)Bicarbonate

(2)Carbonate

(3)Both

(4) CO_2­

Which of the following helps in regulation the respiratory rhythm

(1)Respiratory rhythm centre

(2)Pneumotaxic centre

(3)Aortic arch and carotid artery receptors

(4)All of the above

The respiratory centre is highly sensitive for

The respiratory centre is highly insensitive for

1. CO_2­

2. O_2­

3. H⁺ ions

4. Both 1 and 3

Aortic arch and carotid artery receptors cannot recognise changes in

(1)CO_2­ Concentration

(2)O_2­ Concentration

(3)H⁺ ions Concentration

(4)All of these

Pneumotaxic Centre is present in the

(1)forebrain

(2)midbrain

(3)Hindbrain

(4)Diencephalon

Respiratory rhythm Centre is present in the

(1)forebrain

(2)midbrain

(3)Hindbrain

(4)Diencephalon

Difficulty in breathing due to inflammation  of bronchi and bronchioles leads to

Which of the following disease is caused mainly due to cigarette smoking