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

Which of the labelled blood vessels A, B, C or D carries oxygenated blood?
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  • A and B
  • B and C
  • A and D
  • B and D
Mark the correct pair of muscles involved in the normal breathing in humans.
  • External and internal intercostal muscles
  • Diaphragm and abdominal muscles
  • Diaphragm and external intercostal muscles
  • Diaphragm and intercostal muscles
It is known that exposure to carbon monoxide is harmful to animals because
  • it reduces $$CO_{2}$$ transport
  • it reduces $$O_{2}$$ transport
  • it increases $$CO_{2}$$ transport
  • it increases $$O_{2}$$ transport.
The oxygen - haemoglobin dissociation curve will show a right shift in case of
  • High $$pCO_{2}$$
  • High $$pO_{2}$$
  • Low $$pCO_{2}$$
  • Less $$H^+$$ concentration
What is the value of W, X, Y and Z normally? (in mmHg)
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  • (W) 95
    (X) 40 
    (Y) 45 
    (Z) 40
  • (W) 95
    (X) 40 
    (Y) 40
    (Z)45
  • (W) 40
    (X) 45
    (Y) 95
    (Z) 40
  • (W) 95
    (X) 45
    (Y) 40 
    (Z)40
Mark the incorrect statement in context to $$O_{2}$$ binding to Hb. 
  • Higher pH
  • Lower temperature
  • Lower P$$CO_{2}$$
  • Higher P$$O_{2}$$
  • None of these
Where does exchange of gases ($$O_2$$ and $$CO_2$$) take place in our lungs?
  • Pleura
  • Bronchi
  • Alveoli
  • Trachea
State the respective lowest and highest value of respiratory volumes.
  • TV, VC
  • ERV, IC
  • TV, TLC
  • RV, VC
In which part of the body blood gets oxygenated?
  • Ventricle
  • Lung
  • Atrium
  • Heart
Which of the following gas when passed through dilute blood will impart a cherry red colour to the solution?
  • $$CO_2$$
  • $$COCl_2$$
  • $$NH_3$$
  • $$CO$$
In which of the following places does the formation of oxyhemoglobin occur?
  • Tissues
  • Alveolar surface
  • Blood
  • Plasma
Which of the following symptom is associated with disease emphysema?
  • Widening of alveoli
  • Widening of bronchi
  • Constriction of alveoli
  • Constriction of bronchi
Combination of haemoglobin with $$O_2$$ in lungs can be promoted by
  • Increasing $$CO_2$$ concentration in blood
  • Increasing $$O_2$$ concentration in blood
  • Decreasing $$O_2$$ concentration in blood
  • Introducing $$CO$$ in blood
Lungs made up of which structures 
  • Branching network of Bronchi
  • Bronchioles
  • Alveoli
  • All of the above
If a person exhales out forcefully by applying all his efforts, what will be the pulmonary volume inhaled by him immediately under the normal condition without applying any extra effort?
  • TV + IRV
  • Only TV
  • TV+ERV
  • TV + IRV + ERV
Which of the following can be considered as odd one?
  • Larynx
  • Glucagon
  • Testosterone 
  • Prolactin
Carbon dioxide generated in the tissues is carried in venous blood primarily as 
  • Dissolved gas in plasma
  • Carbamino haemoglobin
  • Sodium bicarbonate
  • Potassium bicarbonate
Oxyhaemoglobin dissociates into oxygen and deoxyhaemoglobin at
  • low $$O_2$$ pressure in tissue
  • high $$O_2$$ pressure in tissue
  • equal $$O_2$$ pressure inside and outside tissue
  • all times irrespective of $$O_2$$ pressure
The volume of air remaining in the lungs even after a forceful expiration is 
  • Tidal volume
  • Residual volume
  • Inspiratory reserve volume
  • Expiratory reserve volume
Which of the following factors affect the oxygen dissociation curve?
  • Partial pressure of carbon dioxide
  • $$pH$$ ($$H^+$$ ion concentration)
  • Temperature
  • Partial pressure of oxygen
  • All of the above
Oxygen dissociation curve in mammals is 
  • J-shaped
  • Sigmoid shaped
  • T-shaped
  • L-shaped
The lungs are protected by two membranes called ________
  • Pleural membrane
  • Meninges
  • Mucous membrane
  • None of the above
In males, ______ play a role in the movement of respiratory system.
  • Vertebrae
  • Sternum
  • Diaphragm
  • Liver
At higher altitudes, the air becomes rarer and amount of oxygen per liter of air decreases.
Increase in all of the following would compensate this decrease for performing normal biological functions of our body, except
  • The concentration of haemoglobin
  • The number of red blood cells
  • The temperature of the body
  • The rate of breathing
Carotid artery supplies 
  • Oxygenated blood to lungs
  • Oxygenated blood to intestine
  • Oxygenated blood to brain
  • None of these
Read the following statements (A to D)
(A) Rib is a flat bone connected vertebral column and dorsally to the sternum.
(B) First seven pairs of ribs are called true ribs.
(C) 8$$^{th}$$ ,9$$^{th}$$ and 10$$^{th}$$  pairs of the ribs are called vertebro sternal ribs.
(D) 10$$^{th}$$ and 11$$^{th}$$ pairs of ribs are not connected dorsally and are therefore called floating ribs.
How many statements are correct?
  • One
  • Two
  • Three
  • None
During inspiration, the diaphragm 
  • Expands
  • Shows no change
  • Contracts and flattens
  • Relaxed to become dome shaped
The gas which we breath out precipitates ______ into milky white.
  • Sodium Chloride solution
  • Calcium Carbonate solution
  • Potassium Permanganate solution
  • Potassium Bicarbonate solution
How many statements are wrong about asthma?

(i) The respiratory surface is decreased.
(ii) The only cause of it is cigarette smoking.
(iii) Due to inflammation of bronchi and bronchioles.
(iv) Alveolar walls are damaged altogether.
(v) Difficulty in breathing causes wheezing.
  • One
  • Two
  • Three
  • Five
Haemoglobin present in human blood binds to oxygen in which oxidation state?
  • $$Fe^{2+}$$
  • $$Fe^{3+}$$
  • $$Fe^{4+}$$
  • $$Fe^+$$
Haemoglobin shows maximum affinity with
  • Carbon monoxide
  • Carbon dioxide
  • Oxygen
  • Ammonia
Respiration involves following steps:
A. Diffusion of gases $${ O }_{ 2 }$$ and $${ CO }_{ 2 }$$ across alveolar membrane.
B. Transport of gases by blood.
C. Utilization of $${ O }_{ 2 }$$  by cell for catabolic reaction and resultant release of $${ O }_{ 2 }$$.
D. Pulmonary ventilation by which atmospheric air is drawn in and $${ CO }_{ 2 }$$ rich air is released out.
E. Diffusion of $${ O }_{ 2 }$$ and $${ CO }_{ 2 }$$ between blood and tissue.
  • $$A\rightarrow B \rightarrow C\rightarrow D\rightarrow E$$
  • $$E\rightarrow D \rightarrow C\rightarrow B\rightarrow A$$
  • $$D\rightarrow A \rightarrow B\rightarrow E\rightarrow C$$
  • $$C\rightarrow B \rightarrow E\rightarrow A\rightarrow D$$
Read the given statements and choose correct answer :-
(i) Initial bronchioles are supported by incomplete cartilagenous rings.
(ii) In human lungs are solid and spongy.
(iii) Alveoli wall contains simple squamous epithelium and white fibrous connective tissue (iv) Lungs are covered by a single layered pleura
  • Three statements are correct
  • Three statements are incorrect
  • Only two statements are correct
  • None of them
Inspiration occurs when
  • Pressure inside lungs is lower than atmospheric pressure
  • Pressure inside lungs is higher than atmospheric pressure
  • Pressure inside lungs is same as atmospheric pressure
  • Pressure has no effect
In man expired air contains oxygen about
  • 4%
  • 10%
  • 16%
  • 20%

During one circuit of blood from lungs to the tissue and back through the circulatory system the percentage of hemoglobin given oxygen is-
  • $$50\%$$
  • $$25\%$$
  • $$75\%$$
  • $$100\%$$
Which of the following is true for $$CO_2$$ concentration?
  • More in alveolar air than in expired
  • More in expired air than in alveolar air
  • More in inspired air than in alveolar air
  • More in inspired air than in expired air
The blood leaving the lungs has its haemoglobin oxygenated and unloads its oxygen to the tissues, because
(2) (3)  (4) 
  • The tissues can absorb $${ O }_{ 2 }$$ from oxyhaemoglobin
  • $${ O }_{ 2 }$$ concentration in tissues is lower and $${ CO }_{ 2 }$$ concentration higher than that of lungs
  • $${ O }_{ 2 }$$ concentration in tissues is higher and $${ CO }_{ 2 }$$ concentration lower than that of lungs
  • Oxyhaemoglobin undergoes reduction
Select the correct match pair:-
  • $$PO_{ 2 }$$ in atmospheric air -40mm Hg
  • $$PCO_{ 2 }$$ in atmospheric air -40mm Hg
  • $$PO_{ 2 }$$ in deoxygenated air -45mm Hg
  • $$PCO_{ 2 }$$ in oxygenated air -40mm Hg
Read the following statements carefully and select the incorrect statement
  • Carbon monoxide binds to Hb with higher affinity than oxygen and forms carboxyhemoglobin
  • Nearly 23% of oxygen is transported as oxyhemoglobin in RBC's of blood.
  • 100 ml of deoxygenated blood delivers approximately 4 ml of $$CO_2$$ to the alveoli under normal physiological conditions.
  • About 72% of $$CO_2$$ gets transported via blood plasma.
Which of the following is correct for oxygen transport ? 
  • Nearly 20-25 percent of $${ CO }_{ 2 }$$ is transported by RBCs
  • 3 percent of $${ O }_{ 2 }$$ is carried in a dissolved state through the plasma
  • Maximum $${ CO }_{ 2 }$$ transport in the form of bicarbonate
  • Both B and C
Which of the following factors are involve in left shifting of oxygen dissociation curve?
  • High $${ PO }_{ 2 }$$ and low pH
  • High $${ PCO }_{ 2 }$$ and high $$H^+$$ concentration
  • Low $${ PO }_{ 2 }$$ and low temperature
  • High $${ PO }_{ 2 }$$ and low temperature
The compound, which is soluble in water but does not impede the oxygen transportation, is
  • NO
  • $$SO_2$$
  • CO
  • $$SO_3$$
When under certain conditions, $${ P }_{ 50 }$$ value in blood rises, the affinity of respiratory pigment of combining with $${ O }_{ 2 }$$ will:
  • Remain same
  • Rise
  • Fall
  • First rise and then fall
What do the trachea and bronchi possess in their wall  of the respiratory tract in man?
  • C-shaped cartilagenous rings
  • C-shaped bony rings
  • V-shaped bony rings
  • V-shaped cartilagenous rings
In the tissues high concentration of carbon dioxide
  • Increase the affinity if haemoglobin to both oxygen and hydrogen
  • Increase the affinity of haemoglobin to oxygen but decrease it affinity to hydrogen
  • Decrease the affinity of Haemoglobin to oxygen but increase its affinity to hydrogen
  • Decrease the affinity of haemoglobin to both hydrogen and oxygen
Which of the following is the correct path of oxygen in humans during inhalation?
  • Nostrils $$\rightarrow$$ Nasal Cavity $$\rightarrow$$ Pharynx $$\rightarrow$$ Trachea $$\rightarrow$$ Bronchi $$\rightarrow$$ Bronchiole $$\rightarrow$$ Alveoli
  • Nostrils $$\rightarrow$$ Nasal Cavity $$\rightarrow$$ Trachea $$\rightarrow$$ Pharynx $$\rightarrow$$ Bronchi $$\rightarrow$$ Bronchiole $$\rightarrow$$ Alveoli
  • Nostrils $$\rightarrow$$ Nasal Cavity $$\rightarrow$$ Pharynx $$\rightarrow$$ Trachea $$\rightarrow$$ Alveoli $$\rightarrow$$ Bronchi $$\rightarrow$$ Bronchiole
  • Nostrils $$\rightarrow$$ Nasal Cavity $$\rightarrow$$ Pharynx $$\rightarrow$$ Bronchi $$\rightarrow$$ Trachea $$\rightarrow$$ Bronchioles $$\rightarrow$$ Alveoli
The mucus produced by the goblet cells 
(I) Moistens the incoming air
(II) Traps the finest dust particles
(III) Filter out largest dust particles
(IV) Warm the incoming air
  • I and II
  • II and III
  • Only IV
  • All of these
Increase in body temperature makes oxygen haemoglobin curve to shift?
  • Right
  • Left
  • Central
  • None of these
Which of the following happens with the increase in body temperature due to enhanced metabolic activities in the human body?
  • Oxyhaemoglobin dissociation curve will shift to right side at tissue level
  • Affinity of haemoglobin for oxygen will increase at tissue level
  • Sensitivity of chemoreceptors to $$pO_2$$ increases dramatically white it falls for $$pCO_2$$ & $$H^+$$
  • Bohr's effect will not occur
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