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CBSE Questions for Class 11 Medical Biology Breathing And Exchange Of Gases Quiz 9 - MCQExams.com

How many cartilages form larynx?
  • 6
  • 15
  • 9
  • 12
Oxygen binding to haemoglobin is
  • Directly proportional to CO2 concentration
  • Directly proportional to CO concentration
  • Inversely proportional to CO2 concentration
  • Independent of CO concentration
Volume of air which remains in conduction airways and is not available for gas exchange is?
  • Vital capacity
  • Anatomic dead space
  • Functional residual capacity
  • Forced expiratory volume
Which is not function of 'conducting part' of respiratory system?
  • Clears the air from foreign particles
  • Humidifies the air
  • Brings the air to body temperature
  • It is site for diffusion of oxygen and carbon dioxide
  • Transports air to alveoli
Amount of Oxygen carried by 100ml arterial blood while passing through tissues is?
  • 0.40.6$ml
  • 46ml
  • 1415ml
  • 1920ml
Read the following statements regarding the mechanism of respiration and choose the correct option.
1. Inspiration occurs only when there is negative pressure in the lungs with respect to the atmosphere.
2. Expiration takes place only when intrapulmonary pressure is lower than atmospheric pressure.
3. Pressure gradients are generated with the help of the diaphragm and intercostal muscles.
4. Inspiration is initiated by the relaxation of the diaphragm.
5. Contraction of the diaphragm reduces pulmonary volume and increases intrapulmonary pressure causing expiration.
  • 1,2 and 5 correct
  • 2 only correct
  • 2,5 correct
  • 1,3 correct
  • 1,4 correct
Find the correctly matched pair.
  • CO2 transported by RBCs about 3%
  • CO2 carried in dissolved state through plasma- 2025%
  • O2 transported by RBCs in blood - 97%
  • CO2 carried as bicarbonate -7%
  • O2 carried in dissolved state through plasma - 7%
Increased body temperature makes oxygenhaemoglobin dissociation curve to.
  • Shift right
  • Shift left
  • Become parabolic
  • Become hyperbolic
Surfactant is?
  • Protein produced by type II alveolar cells
  • Excessive in many premature infants causing difficulty in breathing
  • Decreases surface tension of fluid lining alveoli
  • Lacking in individuals suffering from acute respiratory distress syndromes
Alveoli occur in ______. 
  • Lungs
  • Liver
  • Kidney
  • Brain
Bronchial respiration occurs with the help of.
  • Book lungs
  • Gills
  • Trachea
  • Pulmonary sac
Which has more affinity for haemoglobin?
  • Carbon monoxide
  • Carbon dioxide
  • Oxygen
  • Both B and C
Match and find the correct option.
III
(a)pCO2 of alveoli of lungs(i)40mm Hg
(b)pO2 of atmospheric air(ii)95mm Hg
(c)pO2 of deoxygenated blood(iii)104mm Hg
(d)pO2 of oxygenated blood(iv)159mm Hg
  • a-iii, b-ii, c-i, d-iv
  • a-ii, b-iv, c-iii, d-i
  • a-ii, b-iv, c-i, d-iii
  • a-iii, b-iv, c-i, d-ii
Which of the following is the most appropriate in normal circumstances?
  • During inspiration the intrapulmonary pressure is less than the atmospheric pressure
  • During expiration the intrapulmonary pressure is less than the atmospheric pressure
  • During inspiration the intrapulmonary pressure is more than the atmospheric pressure
  • During expiration the intrapulmonary pressure is equal to atmospheric pressure
Number of alveoli present in human lungs is?
  • 710 million
  • 70100 million
  • 300400 million
  • 8001000 million
A molecule of haemoglobin can carry atoms of oxygen.
  • 2
  • 4
  • 6
  • 8
Identify correct statement regarding transport of respiratory gases through blood
  • Only oxygen is transported
  • Only CO2 is transported
  • Haemoglobin is necessary for transport of O2 and carbonic anhydrase for CO2
  • Haemoglobin is necessary for transport of CO2 and carbonic anhydrase for O2.
Volume of air inspired and expired with each normal breath is known as
  • Residual Volume (RV)
  • Total Lung Capacity (TLC)
  • Vital Capacity (VC)
  • Tidal Volume (TV)
Pulmonary trunk and aorta are attached by
  • Chordae tendinae
  • Ligamentum arteriosus
  • Coronary sulcus
  • Pericardium.
Which of the following increases area of thoracic cavity during inhalation?
  • Outward and upward movement of rib-cage
  • Outward and downward movement of rib-cage
  • Inward and downward movement of rib-cage
  • Inward and upward movement of rib-cage
What does the part labeleld 'a' in the given diagram indicate
674690_7af0a73e82a04c888165212990a8c1e2.JPG
  • White pulp
  • Sinus
  • Medulla
  • Cortex
Which structure of the lungs is directly involved in O2/CO2 exchange between air and blood capillary?
  • Bronchi
  • Trachea
  • Alveoli
  • Secondary bronchi
People who have migrated from the planes to an area adjoining Rohtang Pass about six month back.
  • Have more RBCs and their haemoglobin has a lower binding affinity to O2
  • Are not physically fit to play games like football
  • Suffer from altitude sickness with symptoms like nausea, fatigue, etc
  • Have the usual RBC count but their haemoglobin has very high binding affinity to O2
The entry of food into the larynx is prevented by
  • Mitral valve
  • Diaphragm
  • Frenulum
  • Epiglottis
Emphysema is a
  • Cardiovascular disease
  • Pulmonary disease
  • Neural disease
  • Renal disease
After forceful inspiration, the amount of air that can be breathed out by maximum forced expiration is equal to.
  • Inspiratory Reserve Volume(IRV) + Expiratory Reserve Volume (ERV) + Tidal Volume (TV)+ Residual Volume(RV)
  • IRV + RV + ERV
  • IRV + TV + ERV
  • TV + RV + ERV
Mark the incorrect statement in context to O2 binding to Hb.
  • Higher pH
  • Lower temperature
  • Lower pCO2
  • Higher PO2
Diastasis amounts to which of the following?
  • 2.91% of end diastolic volume
  • 2.91% of end systolic volume
  • 5% of cardiac output
  • 2.91% of stroke volume.
Arrange the following terms regarding process of respiration in chronological order of its decreasing volume of air
I.   Expiratory reserve volume
II.  Vital capacity
III. Tidal volume
IV.  Residual volume
  • IIIVIIII
  • IIIVIIII
  • IIVIIIII
  • IVIIIII 
Name the chronic respiratory disorder caused mainly by cigarette smoking:-
  • Emphysema
  • Asthma
  • Respiratory acidosis
  • Respiratory alkalosis.
Which among the following serves the function of lung surfactant?
  • Phospholipoprotein
  • Peptidoglycan
  • Lecithin
  • Chitin
Membrane separating air in pulmonary alveoli from blood capillaries.
  • Alveolar epithelium
  • Cardiac epithelium
  • Endothelium of blood capillaries
  • Both 1 and 3
Name the chronic respiratory disorder caused mainly by cigarette smoking.
  • Asthma
  • Respiratory acidosis
  • Respiratory alkalosis
  • Emphysema
How the transport of O2 and CO2 by blood happens?
  • With the help of WBCs and blood serum
  • With the help of platelets and corpuscles
  • With the help of RBCs and blood plasma
  • With the help of RBCs and WBCs
A person breathes in some volume of air by forced inspiration after having a forced expiration. This quantity of air taken in is _______________.
  • Total lung capacity
  • Tidal volume
  • Vital capacity
  • Inspiratory capacity
During inspiration, the pressure of air is maximum in ___________.
  • Trachea
  • Bronchus
  • Alveoli
  • Environment
The given graph shows various pulmonary air volumes and capacities. What is depicted by X and Y in the graph?

770860_ffc3701677bd42af8d59bc1dff85d6f9.png
  • Functional residual capacity and vital capacity
  • Total lung capacity and inspiratory capacity
  • Vital capacity and total lung capacity
  • Inspiratory capacity and functional residual capacity
Compared to the atmospheric air, the alveolar air has
  • More pO2 and less pCO2
  • Less pO2 and more pCO2
  • More pO2 and more pCO2
  • Less pO2 and less pCO2
Given below are   few respiratory disorders. Identify occupational respiratory disorders among these.
(i)    Coryza
(ii)   SARS
(iii)  Silicosis
(iv)  Asbestosis 
(v)   Emphysema
  • (i) and (ii)
  • (i) and (v)
  • (iii) and (iv)
  • (i), (ii) and (v)
Which of these epithelia is chiefly involved in function like diffusion and thereby is found in the wall of blood vessels and air sacs of the lungs?
Oxygen dissociation curve of haemoglobin is
  • Sigmoid.
  • Hyperbolic.
  • Linear.
  • Hypobolic.
The sigmoid shape of the dissociation curve is because
  • Binding of oxygen to haemoglobin. As the first oxygen molecule binds to haemoglobin, it increases the affinity for the second molecule of oxygen to bind. Subsequently, haemoglobin attracts more oxygen.
  • The curve shows the equilibrium of oxyhaemoglobin and haemoglobin
  • In the lungs,the partial pressure of oxygen is high
  • Tissues have a low oxygen concentration
Gaseous exchange of oxygen and carbon dioxide between alveolar air and capillaries takes place by
  • Active transport.
  • Diffusion.
  • Carrier-mediated transport.
  • Imbibition.
The maximum number of oxygen molecules that can bind to one molecule of hemoglobin is
  • 8
  • 6
  • 4
  • 2
Direction: Refer the given graph and select the correct options 
Which of these is correct regarding D, E and F areas in the graph?
769388_06abe5afc4034b60b873f6f23ee1b295.JPG
  • D shows venous blood during exercise
  • E shows normal venous blood
  • F shows normal arterial blood
  • All of these
Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because ____________________.
  • There is a negative pressure in the lungs.
  • There is a negative intrapleural pressure pulling at the lung walls.
  • There is a positive intrapleural pressure.
  • Pressure in the lungs is higher than the atmospheric pressure.
The ultimate end parts of the respiratory system in humans are known as
  • alveoli
  • bronchioles
  • tracheoles
  • bronchi
Which structure gives us ability to speech?
  • Epiglottis
  • Vocal cord
  • Larynx
  • Trachea
Which of the following represent correct blood flow pathway in pulmonary circulation?
  • Right Ventricle Aorta Lung Pulmonary Vein Left Atrium
  • Pulmonary Vein Left Atrium Lung Pulmonary Vein Left Atrium
  • Right Ventricle Pulmonary Vein Lung Pulmonary artery Left Atrium
  • Pulmonary Vein Right Atrium Lung Pulmonary Vein Right Atrium
Choose the correct answer from the alternatives given.
Site of gaseous exchange in lungs is:
  • pulmonary chamber
  • trachea
  • bronchioles
  • alveoli
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