A center that moderates the functions of the respiratory rhythm center is located in:

1. Dorsal medulla oblongata

2. Ventral medulla oblongata

3. Pons Varolii

4. Pre-central gyrus of the cerebrum

During normal respiration, the ventral respiratory group located in the medulla oblongata:

1. Establishes the basic respiratory rhythm

2. Controls the switch off point of inspiration

3. Remains inactive

4. Excites chemosensitive zone neurons

Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present at:

1. Pons region of brain

2. Thalamus

3. Spinal cord

4. Right cerebral hemisphere

Which one of the following is the correct statement for respiration in humans?

1. Cigarette smoking may not lead to inflammation of bronchi

2. Neural signals from pneumotoxic centre in pons region of brain can increase the

duration of inspiration

3. Workers in grinding and stone breaking industries may suffer, from lung fibrosis

4. About 90% of carbon dioxide ($C{O}_2$) is carried by haemoglobin as carbamino haemoglobin

The respiratory centre in the brain is stimulated by

1. CO₂ concentration in venous blood

2. O₂ concentration in artery blood

3. CO₂ concentration in artery blood

4. O₂ concentration in venous blood.

Respiration is controlled by

1. medulla oblongata

2. cerebellum

3. hypothalamus

4. cerebrum

Chemosensitive area of respiratory centre medulla is affected by

1. less CO₂ and H⁺ ions

2. less O₂ and H⁺ ions

3. excess CO₂ and H⁺ ions

4. excess O₂ and H⁺ ions.

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