An increase from pH 7.2 to pH 7.4 around hemoglobin causes

1. hemoglobin to release all bound oxygen molecules.

2. an increase in the affinity of hemoglobin to bind oxygen molecules.

3. hemoglobin to denature.

4. an increase in the binding of H⁺ by hemoglobin.

All the following facilitate binding of oxygen to hemoglobin at alveoli except:

1.  Low pO₂

2.  Low pCO₂

3.  Lesser H⁺ concentration

4.  Lower temperature

In which of the following disease alveolar walls are damaged due to which respiratory surface is decreased

(1)Asthma

(2)Emphysema

(3)Bronchitis

(4)Rhinitis

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

(1)Asthma

(2)Emphysema

(3)Bronchitis

(4)Rhinitis

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

(1)Asthma

(2)Emphysema

(3)Occupational Lung Disease

(4)Rhinitis

Respiratory rhythm Centre is present in the

(1)forebrain

(2)midbrain

(3)Hindbrain

(4)Diencephalon

Pneumotaxic Centre is present in the

(1)forebrain

(2)midbrain

(3)Hindbrain

(4)Diencephalon

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

The respiratory centre is highly insensitive for

(1)CO_2­

(2)O_2­

(3)H⁺ ions

(4)Both A and C

The respiratory centre is highly sensitive for

(1)CO_2­

(2)O_2­

(3)H⁺ ions

(4)Both A and C