Fill in the blanks and choose the correct option given below.

(i) CO 2 + H 2 O H 2 CO 3

The above reaction is catalyzed by enzyme , which is present in higher concentration in and in minute concentration in of blood.

(ii) Every 100 ml of deoxygenated blood delivers approximately ml of CO 2 in alveoli.

(iii) Exchange of O 2 and CO 2 at the alveoli and tissues occur by .

(iv) Respiratory rhythm is maintained by the respiratory center in region of brain.

(v) A centre in pons region of brain and chemosensitive area in the medulla can alter respiratory mechanism.

(vi) The chemosensitive area in medulla is sensitive to and .

(vii) Receptors associated with aorthic arch and recognize changes in CO 2 and H + concentration.

(viii) is a difficulty in breathing causing wheezing due to inflammation of bronchi and bronchioles.

(ix) Emphysema is a chronic disorder in which are damaged due to which respiratory surface is decreased.

(x) Long exposure to dust, in industries involving grinding or stone-breaking, can lead to inflammation leading to and thus cause serious lung damage.