Which of the following helps in the regulation of 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

1. CO_2­

2. O_2­

3. H⁺ ions

4. Both A and C

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

Which of the following is not true about hering breuer reflex

1. It is activated when a normal mechanism to switch off inspiration does not work timely due to any reason.

2. It is activated when a normal mechanism to switch off expiration does not work timely due to any reason

3. It prevents the alveoli from overstretching and bursting

4. It normally remains inactive

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

1. Asthma

2. Emphysema

3. Occupational Lung Disease

4. Rhinitis

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

1. Asthma

2. Emphysema

3. Bronchitis

4. Rhinitis

A combination of carbon dioxide and hemoglobin, CO2HHb, being one of the forms in which carbon dioxide exists in the blood is the
1. oxyhemoglobin.
2. deoxyhemoglobin.
3. carboxyhemoglobin.
4. carbaminohemoglobin

Arrange the following modes of transport of carbon dioxide in the blood from the most common to the least common.
1. bicarbonate ions
2. combined with blood proteins
3. dissolved in plasma
Choose the arrangement that lists them in the correct order from largest to smallest percentage of carbon dioxide transported.
1. 1, 2, 3
2. 1, 3, 2
3. 2, 3, 1
4. 2, 1, 3

When fully saturated, the number of molecules each hemoglobin molecule can carry is:
1. one
2. two
3. three
4. four