Breathing and Exchange of Gases (Rais Sir) - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718Breathing and Exchange of Gases (Rais Sir) - Live Session - NEET 2020Contact Number: 9667591930 / 8527521718In human beings, oblique fissures are associated with :
1. Right lung
2. Left lung
3. Both lungs
4. None of the above
Which of the following does not shift the oxy-haemoglobin dissociation curve to the right ?
1. increased pH
2. increased carbon dioxide
3. increased temperature
4. increased 2,3-DPG
Which of the following is entirely made of cartilage ?
1. Nasal septum
2. Larynx
3. Glottis
4. Trachea
Volume of air that will remain in lungs after a normal expiration is about :
1. 1200 ml
2. 2300 ml
3. 4600 ml
4. 5800 ml
The partial pressure of oxygen is equal
1. Atmospheric air and Alveoli
2. Alveoli and Oxygenated blood
3. Alveoli and Deoxygenated blood
4. Deoxygenated blood and Tissues
A center that moderates the functions of the respiratory rhythm center is located in:
1. Dorsal medulla oblangata
2. Ventral medulla oblongata
3. Ponsvarolli
4. Pre central gyrus of the cerebrum
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 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
Oxygen is mainly transported as oxyhaemoglobin in the blood. Identify the correct statement regarding oxygen transport in blood:
1. During normal activity, a molecule of haemoglobin returning to the lungs carries one molecule of O2
2. During conditions of acidosis, haemoglobin is able to carry oxygen more efficiently
3. Increased BPG levels in the red blood cells enhance oxygen-carrying capacity.
4. A 50% oxygen saturation level of blood returning to the lungs might indicate an activity level higher than normal
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. Excite chemosensitive zone neurons
The following statements refer to gas carriage by the blood :
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
The trachea is lined with
1. ciliated simple squamous epithelium
2. stratified squamous epithelium
3. pseudostratified ciliated columnar epithelium
4. pseudostratified squamous epithelium
Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because
1. there is 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
People who have migrated from the planes to an area adjoining Rohtang Pass about six months back
1. have mroe RBCs and their haemoglobin has a lower binding affinity to O2
2. are not physically fit to play games like football
3. suffer from altitude sickness with symptoms like nausea, fatigue, etc.
4. have the usual RBC count but their haemoglobin has very high binding affinity to O2
Which one of the following statements is incorrect ?
1. The residual air in lungs slightly decreases the efficiency of respiration in mammals
2. The presence of non-respiratory air sacs, increases the efficiency of respiration in birds
3. In insects, circulating body fluids serve to distribute oxygen to tissues
4. The principle of countercurrrent flow facilitates efficient respiration in gills of fishes
The respiratory centre in brain is stimulated by
1. CO2 concentration in venous blood
2. O2 concentration in artery blood
3. CO2 concentration in artery blood
4. O2 concentration in venous blood
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
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 : Most fish when out of water, die of suffocation
Reason : Atmospheric air contains far less oxygen content than the dissolved oxygen in water
Assertion : Forceful expiration occurs through expiratory muscles
Reason : Expiratory muscles expires quickly
Assertion : Abdominal muscles is related with respiration in animals
Reason : Relaxation of abdominal muscles draws in air
Choose the wrong statement
1. CO2 is the harmful molecule and released during catabolic reactions
2. Respiration will always require O2
3. Breathing is a part of respiration
4. All of the above
In water, frogs respire through
1. Skin
2. lungs
3. buccal cavity
4. All of these
Which of the following comprise the lungs
1. trachea along with network of bronchi, bronchioles and alveoli
2. network of bronchi, bronchioles and alveoli
3. alveoli only
4. Both A and B
Which of the following is true for diaphragm except
1. muscular structure
2. found in all vertebrates
3. It helps in breathing, urine elimination and child birth
4. It is dome shaped in normal condition
How many of the following are steps of respiration
Pulmonary respiration, diffusion, transport of gases, energy production
1. 4
2. 3
3. 2
4. 1
The breathing rate of human embryo ___ times/minute
1. 70-72
2. 20-25
3. 12-16
4. None of these
Which one is odd out regarding breathing rate
1. heart beat rate
2. B.M.R
3. CO2 concentration
4. Body size
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
The volume of air expired normally after forceful inspiration
1. TV + IRV
2. TV + ERV
3. TV
4. None of these
The effect of pH on dissociation of oxyhaemoglobin is called
1. Bohr's effect
2. Root effect
3. Haldane effect
4. None of these
The red coloured, Fe containing pigment present in the Human body is
1. Haemoglobin
2. Myoglobin
3. Globin
4. Both A and B
Carbonic anhydrase is present in
1. RBC
2. Plasma
3. Both A and B
4. Tissues
The chloride ions diffuse into the erythrocytes to maintain the electrochemical neutrality, this phenomenon is called
1. Hamburger phenomenon
2. Chloride shift
3. Haldane effect
4. Both A and B
Which of the following is not true about hering breuer reflex arc
1. It is activated when a normal mechanism to switch off inspiration does not work timely due to any reason
2. It is activated when a normal mechanism to switch off expiration does not work timely due to any reason
3. It prevents the alveoli from overstretching and bursting
4. It normally remains inactive
In mammals ventilation movements of lungs are governed by
1. Muscular wall of lungs
2. Intercostal muscles
3. Diaphragm
4. Diaphragm and intercostal muscles
Which of the following statements is incorrect about transport of gases ?
1. About 97 percent of O2 is transported by RBCs in the blood
2. 3 percent of O2 is carried in dissolved state in the plasma
3. 20-25 percent of CO2 is transported by RBCs in the form of carbaminohaemoglobin
4. 70 percent carbon dioxide is carried in dissolved state in plasma
Tick mark the incorrect statement
1. Every 100 ml of deoxygenated blood delivers approximately 4 ml of CO2 to the alveoli
2. Carbonic anhydrase is present in bery high concentration in RBC
3. High pCO2 and low pO2 in tissues help in binding of carbon dioxide
4. CO2 is carried in haemoglobin as carboxyhaemoglobin
How much CO2 is delivered to the alveoli by every 100 ml of deoxygenated blood ?
1. 6 ml
2. 4 ml
3. 5 ml
4. 3 ml
Which substances when present in high level can activate the chemosensitive area present adjacent to rhythm centre ?
1.
2.
3.
4.
To which part of Hb, CO2 binds ?
1. Haem
2. Amino group of globin
3. Iron of haem group
4. Carboxy group of globin
A chronic disorder in which alveolar walls are damaged due to excessive cigarette smoking is
1. Asthma
2. Emphysema
3. Silicosis
4. Bronchitis
A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. This O2
1. Helps in releasing more O2 to the epithelial tissues
2. Acts as a reserve during muscular excercise
3. Raises the pCO2 of blood 75 mm of Hg
4. Is enough to keep oxyhaemoglobin saturation at 96 %
Although much is carried in blood, yet blood does not become acidic, because
1. is continuously diffused through the tissues and is not allowed to accumulate
2. In transport, blood buffers play an important role
3. is absorbed by the leucocytes
4. combines with water to form which is neutralized by