breathing and exchange of gases
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53 questions
| 🇬🇧 | 🇬🇧 |
| If the respiratory rate of 'A' is 35 breaths/min and tial volume 185cc/ breath and of 'B' is 25 breaths/min and tidal volume 259 cc/breath then | Pulmonary ventilation of 'a' is greater than 'b' |
| During oxygen transport the oxyhaemoglobin at the tissue level librates oxygen to the cells because in tissue | O2 tension is low and CO2 tension is high |
| Pleura is a | Double membraned structure |
| Respiration results in | Release of CO2 |
| Maximum expiration after full inspiration is called | Vital capacity |
| In which of the follwong sequence is the CO2 diffused out of the body | Endothelium-->basement membrane-->squamous epithelium |
| In which of the following the partial pressure of O2 is 95 mm of Hg - | Pulmonary vein and systemic arteries |
| Trachea gets divided into left and right primary bronchi at the level of - | 5th thoracic vertebra |
| The enzyme, carbonic anhydrase is found in | More in erthyrocytes and less in plama |
| Pleura is a | Double membrane |
| Respiration results in | Release of CO2 |
| Maximum expiration after full inspiration is called | Vital capacity |
| Trachea is a straight tube extending up to the | Anterior of thorasic cavity |
| The total volume of air accommodated in the lungs at the end of forced expiration is sum total of | IRV+TV+RV |
| The partial pressure of oxygen in alveolar air and oxygenated blood respectively | 104mm Hg and 95 mm Hg |
| About 97 per cent of O2 is transported by | RBC's in the blood |
| The conducting part of respiratory system extends upto | Respiratory bronchioles |
| Residual air mostly occurs in | Bronchus |
| For proper transport of O2 and CO2 blood should be | Slightly alkaline |
| What would happen when blood is acidic | Oxy-haemoglobin curve shifted toward right |
| Respiratory process is regulated by certain specialised centres in the brain one of the following listed centres can reduce the inspiratory duration upon stimulation | Medullary expiratory centre |
| Vital capacity of lungs is | TV+IRV+ERV |
| The type of tissue lining the nasal passage, bronchioles and fallopian tubes is | Columnar ciliated epithelium |
| Residual volume is | Greater than tidal volume |
| Increasing order of volumes | Tidal<residual<inspiratory<vital |
| Wha is the vital capacity of our lungs | Total respiratory volume-residual volume |
| Which of the following factors raise the P50 valve and shifts the HbO2 dissociation curve to the right | Rise in Pco2 and H+(fall in pH) |
| Hypoxia is the condition in which less oxygen become available to the tissues, this may be due to | Less oxygen in atmosphere, more CO2 in air and less RBC'S in blood |
| Percentage of CO2 carried by human RBC | 20-25 per cent |
| Fill in the blanks | A-159, B-40, C-40, D-40, E-40 |
| In the lungs pneumocyte type-II cell secrete lecithin. what will happen when these cells become inactive | Alveoli get collapsed |
| Incomplete cartilaginaous rings present in- | Trachea and primary bronchus, secondary bronchi and tertiary bronchi |
| Low pCO2 , lesser H+ concentration and lower temperature enhance | Affinity of O2 with Hb and hence O2-Hb dissosiation curve shifts to the left side |
| Reduction in pH of blood will | Decrease the affinity of haemoglobin with oxygen |
| The partial pressure of oxygen in the alveoli of the lungs is | More than that in the blood |
| Lungs do not collapse between breaths and some air always remains in the lungs which can never be expellled because | There is -ve intraapleural pressure pulling at the lung walls |
| Which reaction occur in pulmonary cappilaries | Hb+O2---->HbO2 |
| A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues, this O2 | Acts as a reserve during muscular exercise |
| What is a possibility for most of us in regard to breathing , by making a conscious effort | One can breathe out air through eustachian tubes by closing both the nose and mouth |