Q. No.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.
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.
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%.
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.
The given figure shows schematic plan of blood circulation in humans with labels A to D. Identify the labels along with their functions and select the correct option.
(1) C - Vena Cava - takes blood from body parts to right atrium, PCO2 = 45 mm Hg
(2) D - Dorsal aorta - takes blood from heart to body parts, PO2 = 95 mm Hg
(3) A - Pulmonary vein - takes impure blood from body parts to heart, PO2 = 60 mm Hg
(4) B - Pulmonary artery - takes blood from heart to lungs, PO2 = 90 mm Hg.
The volume of 'anatomical dead space’ air is normally
(1) 230 mL
(2) 210 mL
(3) 190 mL
(4) 150 mL.
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
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
Assertion : Aerobic animals are not truely aerobic.
Reason : They produce lactic acid anaerobically.
- If both the assertion and the reason are true and the reason is a correct explanation of the assertion
- If both the assertion and reason are true but the reason is not a correct explanation of the assertion
- If the assertion is true but the reason is false
- If both the assertion and reason are false
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