Breathing and Exchange of Gases - Live Session - 02 Oct 2020Contact Number: 9667591930 / 8527521718
Page:
1.
When under certain conditions, the P50 value of haemoglobin rises, the affinity of the pigment of combining with O2 will
1. Remain same
2. Rise
3. Fall
4. First rise and then fall
2.
Hemoglobin that is bonded to carbon monoxide and therefore cannot transport oxygen, is called
1. carboxyhemoglobin
2. methemoglobin
3. reduced hemoglobin
4. carbaminohemoglobin
3.
Trachea divides into two right and left primary bronchi at the level of:
1. Seventh cervical vertebra
2. Third thoracic vertebra
3. Fifth thoracic vertebra
4. Seventh thoracic vertebra
4.
Contraction of diaphragm:
| 1. | Increases the volume of the thoracic chamber in the antero-posterior axis |
| 2. | Increases the volume of the thoracic chamber in the dorso-ventral axis |
| 3. | Decreases the volume of the thoracic chamber in the antero-posterior axis |
| 4. | Decreases the volume of the thoracic chamber in the dorso-ventral axis |
5.
The partial pressure of oxygen is equal in
1. Atmospheric air and Alveoli
2. Alveoli and Oxygenated blood
3. Alveoli and Deoxygenated blood
4. Deoxygenated blood and Tissues
6.
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
7.
Premature infants may develop respiratory distress and can land up in respiratory failure sometimes needing an intensive care for such infants. This may be due to:
1. the sudden change from the uterine environment to the air
2. the incomplete development of the lung surface
3. inadequate production of surfactant
4. mutations in the genes involved in lung formation
8.
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
9.
The following statements refer to gas carriage by blood. Choose the correct statement:
| 1. | After leaving the lungs, each litre of blood contains about 20 ml of oxygen. |
| 2. | Haemoglobin is half saturated with oxygen when the PO2 is about 30 mm Hg |
| 3. | As the PCO2 rises, the affinity of haemoglobin for oxygen is increased. |
| 4. | Each litre of arterial blood contains about 50 mL of carbon dioxide. |
10.
Study the spirograph and identify the correctly matched volumes from the codes given:
TV IRV ERV RV VITAL CAPACITY
1. A c B D E
2. A B C D E
3. B A C D E
4. C B A D E
11.
Fibrous connective tissue builds up in the lungs causing them not to inflate properly, and actually deflating them is called:
1. chronic bronchitis
2. emphysema
3. pulmonary fibrosis
4. asthma
12.
The trachea is lined with
1. ciliated simple squamous epithelium
2. stratified squamous epithelium
3. pseudostratified ciliated columnar epithelium
4. pseudostratified squamous epithelium
13.
Match each item in Column I with one item in Column II regarding and choose your answer from the codes given below :
Column I | Column II | ||
I. | Nereis | 1. | Gills |
II. | Prawn | 2. | Parapodia |
III. | Earthworm | 3. | Skin |
IV. | co*ckroach | 4. | Trachea |
I | II | III | IV | |
1. | 1 | 2 | 3 | 4 |
2. | 2 | 1 | 4 | 3 |
3. | 2 | 1 | 3 | 4 |
4. | 1 | 2 | 4 | 3 |
14.
Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because
(1) there is a negative pressure in the lungs
(2) there is a negative intrapleural pressure pulling at the lung walls
(3) there is a positive intrapleural pressure
(4) pressure in the lungs in higher than the atmospheric pressure
15.
Name the chronic respiratory disorder caused mainly by cigarette smoking
1. asthma
2. respiratofy acidosis
3. respiratory alkalosis
4. emphysema
16.
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 RBC
4. as carbamino-haemoglobin
17.
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
characteristic.
1. A-trachea-long tube supported by complete cartilaginous rings for conducting
inspiredair
2. 8-pleural membrane-surround ribs on both sides to provide cushion against rubbing
3. C-alveoli-thin walled vascular bag-like structures for exchange of gases
4. D-lower end of lungs-diaphragm pulls it down during inspiration
18.
Which two of the following changes (1-4) usually tend to occur in the plain dwellers when
they move to high altitudes (3,500 m or more)?
(1) Increase in red blood cell size
(2) Increase in red blood cell production
(3) Increased breathing rate
(4) Increase in thrombocyte count Changes occurring are
1. (2) and (3)
2. (3) and (4)
3. (1) and (4)
4. (1) and (2)
19.
The haemoglobin of a human foetus
1. has a lower affinity for oxygen than that of the adult
2. its affinity for oxygen is the same as that of an adult
3. has only 2 protein subunits instead of 4
4. has a higher affinity for oxygen than that of an adult
20.
When a man inhales air containing normal concentration of O2 as well as CO he suffers from suffocation because
(1) CO reacts with O2 reducing its percentage in air
(2) haemoglobin combines with CO instead of O2 and forms carboxyhaemoglobin
(3) CO affects diaphragm and intercostal muscles
(4) CO affects the nerves of the lungs.
21.
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.
22.
Assertion : Most fish when out of water, die of suffocation.
Reason : Atmospheric air contains far less oxygen content than the dissolved oxygen in water.
23.
Assertion : Forceful expiration occurs through expiratory muscles.
Reason : Expiratory muscles expires quickly.
24.
Assertion : Insects develop a complex system of air tubes called trachea for respiratory purpose.
Reason : Exchange through body surface is not possible in insects.
25.
Assertion : Severe Acute Respiratory Syndrome (SARS) originated in China.
Reason : China is the most populated country of the world
1. Both Assertion (A) and Reason (R) are the true and Reason (R) is a correct explanation of Assertion (A).
2.Both Assertion (A) and Reason (R) are the true but Reason (R) is not a correct explanation of Assertion (A).
3.Assertion (A) is true and Reason (R) is false.
4. Assertion (A) is false and Reason (R) is true
26.
Which of the following is true about respiration
(1)it is for energy liberation
(2)it can occur both O2 presence and its absence
(3)In humans R.B.C show anaerobic respiration
(4)All of these
27.
In water, frogs respire through
(A)Skin
(B)lungs
(C)buccal cavity
(D)All of these
28.
Which of the following is incorrect
(1)Whale-Lungs
(2)Tadepole larva-Gills
(3)Earthworm-moist skin
(4)Spider-lungs
29.
Which of the following is true about pleural membranes except
1. outer pleural membrane is in close contact with the thoracic lining
2. inner pleural membrane is in contact with the lung surface
3. pleural fluid is present between them
4. It increases friction on the lung surface
30.
Which of the following is true
(1)Right lungs is greater than left lungs
(2)structural and functional unit of lungs is alveoli
(3)lungs are non muscular
(4)All of the above
31.
In the process of respiration how many times the process of diffusion takes place in respiration
1. 4
2. 3
3. 2
4. 1
32.
The breathing rate of human embryo ______times/minute.
(1)70-72
(2)20-25
(3)12-16
(4)None of these
33.
Which of the following factors will increase the breathing rate
(1)Acidity
(2)decrease in pH
(3)Blood pressure
(4)All of the above
34.
Volume of air which does not participate in gaseous exchange is
(1)Residual volume
(2)Dead space air
(3)Tidal volume
(4)Both A and B
35.
The volume of air expired forcefully after forceful inspiration
(1)TV+ IRV
(2)TV+ERV+IRV
(3)TV+ERV+IRV+RV
(4)None of these
36.
Which of the following is true for transport of gases
1. Maximum amount of O2 is transported by RBCs
2. Maximum amount of CO2 is transported by Plasma as Bicarbonates
3. Plasma transports both CO2 and O2
4. All of the above
37.
A __________is obtained when percentage saturation of Hb with O2 is plotted against the pO2.
(1)J shaped curve
(2)Sigmoid Curve
(3)Exponential curve
(4)None of these
38.
How many of the following factors are favourable for the shifting of Oxyhaemoglobin dissociation Curve to the left side
low pO2, high pCO2, more H+ Concentration, Higher temperature, High pO2, Low pCO2, less H+ Concentration, lower temperature.
1. 3
2. 4
3. 5
4. 6
39.
Aortic arch and carotid artery receptors cannot recognise changes in
1. CO2 Concentration
2. O2Concentration
3. H+ ions Concentration
4. All of these
40.
How many of the statements given below are correct?
I. During inspiration the diaphragm moves upward while the thorax expands and moves outward.
II. The anatomical dead space represents the air that is trapped in the alveoli and is around 150mL.
III. Decreasing blood oxygen and increasing carbon dioxide cause the major increases seen in breathing rate during strenuous exercise.
IV. Oxygen dissociates faster from hemoglobin during exercise.
V. Increased pH shifts oxyHb-dissociation curve to the right.
1. 2
2. 3
3. 4
4. 5
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