Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.
Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported to the lungs
1. as bicarbonate ions
2. in the form of dissolved gas molecules
3. by binding to R.B.C
4. as carbamino-haemoglobin
The figure shows a diagrammatic view of human respiratory system with labels A, B, C and D. Select the option which gives correct identification and main function and/or characteristics.
1. B-pleural membrane-surround ribs on both sides to provide cushion against rubbing.
2. C-alveoli-thin walled vascular bag like structures for exchange of gases.
3. D-lower end of lungs-diaphragm pulls it down during inspiration.
4. A-trachea-long tube supported by complete cartilaginous rings for conducting inspired air.
Which one of the following is the correct statement for respiration in humans?
1. Cigarette smoking may lead to inflammation of bronchi
2. Neural signals from pneumotaxic 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 (CO2) is carried by haemoglobin as carbaminohaemoglobin
People who have migrated from the planes to an area adjoining Rohtang Pass about six months back
1. Have more RBCs and their haemoglobin has lower binding affinity to 02
2. Are not physically fit to play games like football
3. Suffer from altitude sichness with symptoms like nausea, fatigue, etc.
4. have the usual RBC count but their haemoglobin has very binding affinity to 02
Two friends are eating together on a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of
The figure given below shows a small part of the human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function?
1. A – Alveolar cavity – main site of exchange of respiratory gases
2. D – Capillary wall – exchange of O2 and CO2 takes place here
3. B – Red blood cell – transport of CO2 mainly.
4. C – Arterial capillary – passes oxygen to tissues
1. raises the Pco2 blood to 75 mm of Hg
2. is enough to keep oxyhaemoglobin
3. helps in releasing more O2 to the epithelial tissues
4. acts as a reserve during muscular exercise
Bulk of carbon dioxide (CO2) released from body tissues into the blood is present as :
1. carbaminohaemoglobin in RBCs
2. bicarbonate in blood plasma and RBCs
3. free CO2 in blood plasma
4. 70% carbaminohaemoglobin and 30% as bicarbonate