Respiration is controlled by

1. medulla oblongata

2. cerebellum

3. hypothalamus

4. cerebrum

Subtopic:  Respiratory System: Regulation of Respiration |
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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.

Subtopic:  Respiratory System: Regulation of Respiration |
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Oxygen binding to haemoglobin in blood is

1. directly proportional to the concentration of CO2 in the medium

2. inversely proportional to the concentration of CO2 in the medium

3. directly proportional to the concentration of CO in the medium

4. independent of the concentration of CO in the medium.

Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases |
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Carbon dioxide (CO2) diffuses into blood from tissue site and passes to alveolar site in the form of

1. bicarbonate; 70%

2. bicarbonate; 20 - 25%

3. carbaminohaemoglobin; 60 - 70%

4. carbaminohaemoglobin; 7%.

Subtopic:  Respiratory System: Transport of Gases Part 2 |
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Hiccups can be best described as

(1) forceful sudden expiration

(2) forceful contraction of intercostal muscles during deep breathing

(3) vibration of the soft palate during breathing while sleeping

(4) jerky incomplete inspiration.

Subtopic:  Respiratory System: Pulmonary Ventilation |
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The volume of 'anatomical dead space’ air is normally

(1) 230 mL

(2) 210 mL

(3) 190 mL

(4) 150 mL.

Subtopic:  Respiratory System: Pulmonary Volumes & Capacities |
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Oxyhaemoglobin dissociates into oxygen and deoxyhaemoglobin at

1. low O2, pressure in tissue

2. high O2, pressure in tissue

3. equal O2, pressure inside and outside tissue

4. all times irrespective of O2, pressure

Subtopic:  Respiratory System: Transport of Gases |
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A person sitting at rest experiences a temporary cessation of breathing after forced deep breathing for a few minutes.This is due to:-

(1) too much CO2 in the blood

(2) too much O2 in the blood

(3) very little CO2 in the blood

(4) both high O2 and very little CO2 in the blood

Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
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Epidermis is specialized for :-
(1) respiration

(2) absorption

(3) protection

(4) All of these

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In the blood of an adult man the total content of haemoglobin is roughly

(1) several hundred grams

(2) tens of gram (10-100 g)

(3) several grams

(4) several hundred milligram

Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases |
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