CBSE Questions for Class 11 Medical Biology Breathing And Exchange Of Gases Quiz 14 - MCQExams.com

The volume of air inspired or expired by a healthy man per minute is
  • 1000 ml -  1100 ml
  • 2500 ml - 3000 ml
  • 6000 ml - 8000 ml
  • 400 ml - 500 ml
Cardiac notch is found on
  • Right lung
  • Left lung
  • Diaphragm
  • None of the above.
Signet ring cartilage of larynx is:
  • Cricoid
  • Arytenoid
  • Thyroid
  • All of the above
During inspiration, air passes into lungs due to
  • Increase in volume of thoracic cavity and fall in lung pressure
  • Fall in pressure inside the lungs
  • Increased volume of thoracic cavity
  • Muscular expansion of lungs
Lungs ventilation movement are due to the movements of
  • Diaphragm only
  • Wall of the lungs
  • Coastal muscles and diaphragm
  • Coastal muscles only
Lining of trachea is made of
  • Simple squamous epithelium
  • Simple cuboidal epithelium
  • Pseudostratified epithelium
  • Stratified cuboidal epithelium
Respiratory structures in insects are called as
  • Gills
  • Skin
  • Lungs
  • Trachea
Disease called pleurisy is due to 
  • Inflammation of pleura
  • Inflammation of trachea
  • Inflammation of alveoli
  • None of the above
Percentage of O$$_2$$ present in inhaled air in man is about 
  • 21%
  • 78%
  • 1%
  • 43%
Consider the following statements A-D.
A. Epiglottis is the cartilaginous flap of skin which regulates the flow of air into the trachea.
B. Pleura is the ultimate region where in which the diffusion of air between the lungs and blood takes place.
C. Larynx is the voice box, which is the enlarged part of trachea.
D. "Adam's apple" is the protruding cartilage of the voice box of male humans.
The correct and wrong statements are given in

  • A and B are correct; while C and D are wrong.
  • B and C are correct; while A and D are wrong.
  • C and D are correct; while A and B are wrong.
  • A and D are correct; while B and C are wrong.
The tissue respiration refers to 
  • Inspiration
  • External respiration
  • Internal respiration
  • Expiration
About 30% of CO$$_2$$ is transported as 
  • Carbamino compounds
  • Bicarbonates of Na and K
  • Carboxyhaemoglobin
  • Oxyhaemoglobin
A person normally breathe how much volume of air in 24 hours?
  • 15000 litres
  • 1500 litres
  • 500 litres
  • 5000 litres
Which of the following bone forms the inferior part of nasal septum?
  • Ethmoid
  • Vomer
  • Girdle
  • Stapes
The given diagram shows respiratory system of man.Which of the following correctly shows the functions of the parts labelled W, X, Y and Z?
319087_c9b62a30eed6409d871aa14207e0b74b.png
  • W - Facilitates movement of air by expansion and contraction, X - Traps dust and helps to filter inhaled air, Y - Prevents the wind pipe from collapsing, Z - Help in exchange of gases.
  • W - Helps in gaseous exchange, X - Traps dust and helps to filter inhaled air, Y - Serves as a common passage for air and food, Z - Protect the lungs from damage.
  • W - Prevents the wind pipe from collapsing, X - Serves as a common passage for air and food, Y - Helps in upward and downward movement of ribcage, Z - Trap dust and help to filter inhaled air.
  • W - Facilitates movement of air by expansion and contraction, X - Helps in gaseous exchange, Y - Serves as a common passage for food and air, Z - Protect the lungs from damage.
Abhirami runs to her class rooms as the school ball rang. What will be the probable rate of breathing in her lungs due to this vigorous act?
  • 15 to 18 times per minute
  • 16 to 20 times per minute
  • 18 to 25 times per minute
  • 20 to 25 times per minute
If the CO$$_2$$ concentration in the blood increases, the breathing shall 
  • Increase
  • Decrease
  • Affected
  • Stop
The narrowest and most numerous tubes of lungs are called as
  • Bronchi
  • Alveoli
  • Bronchioles
  • Tertiary bronchi
During inspiration in man,
  • The external intercostal muscles relax
  • Due to contraction of external intercostal muscles and flattening of diaphragm, the volume of thoracic cavity increases
  • Due to contraction of external intercostal muscles and flattening of diaphragm, the volume of thoracic cavity decreases
  • The abdominal muscles contract
If the respiratory rate of 'A' is 35 breaths/min and tidal volume 185 cc/breath and of 'B' is 25 breaths/min and tidal volume 29 cc/breath then
  • Pulmonary ventilation of 'A' and 'B' is same.
  • Alveolar ventilation of'A' and 'B' is same.
  • Pulmonary ventilation of 'A' is greater than 'B'.
  • Alveolar ventilation of 'A' is greater than 'B'.
The presence of CO$$_2$$ in blood will lower pH because CO$$_2$$ combines with .......... with the rate of reaction increased by ...........
  • H$$_2$$O to form H$$^+$$ and HCO$$_3 {^-}$$, carbonic anhydrase
  • H$$_2$$O to form only HCO$$_3{^-}$$, carbonic anhydrase
  • H$$_2$$O to form only H$$^+$$, carbonic ions
  • H$$^+$$ to form HCO$$_3{^-}$$, oxyhaemoglobin
Match the items listed under Column-I with those given under Column-II; choose the appropriate option from the given choices.
Column-IColumn-II
$$A$$. Residual Volume (RV)$$P$$. 4000ml-4600ml
$$B$$. Inspiratory Reserve Volume (IRV)$$Q$$. 1100ml-1200ml
$$C$$. Vital Capacity (VC)$$R$$. 1000ml-1100ml
$$D$$. Expiratory Reserve Volume (ERV)$$S$$. 3000ml-3500ml
$$E$$. Inspiratory Capacity (IC)$$T$$ 2500ml-3000ml
  • $$A-Q;B-R;C-S;D-T;E-P$$
  • $$A-R;B-T;C-P;D-Q;E-S$$
  • $$A-T;B-Q;C-S;D-R;E-P$$
  • $$A-Q;B-T;C-P;D-R;E-S$$
Choose the most appropriate combination of components of respiratory membrane, from the following.
  • Alveolar wall and ducts.
  • Inner and outer pleural membranes and pleural fluid.
  • Membranes of alveolar ducts and capillaries.
  • Alveolar wall, alveolar capillary and interstitial space.
After forceful inspiration, the amount of air that can be breathed out by maximum forced expiration is equal to
  • IRV + ERV + TV + RV
  • IRV + RV + ERV
  • IRV + TV + ERV
  • TV + RV + ERV
Name the chronic respiratory disorder caused mainly by cigarette smoking.
  • Emphysema
  • Asthma
  • Respiratory acidosis
  • Cough
A person has 400 million alveoli per lung with an average radius of 0.1m for each alveolus. Considering the alveoli are spherical in shape, the total respiratory surface of that person is closest to.
  • $$500 \,mm^2$$
  • $$200 \,mm^2$$
  • $$100 \,mm^2$$
  • $$1000 \,mm^2$$
In a resting person, oxygen saturation of haemoglobin as blood leaves the tissue capillaries is?
  • $$3\%$$
  • $$40\%$$
  • $$46\%$$
  • $$75\%$$
What is function of region labelled as 'a' in the given diagram?
669376_d5e3ca95b6044d1f85c1a9eb47dbc1e4.png
  • Sound producing
  • Warmth producing
  • Passage to lungs
  • Connective of larynx
Which of the following determines the structure of nose?
  • Ethamoid bone
  • Nasal septum
  • Incus
  • Both A and B
Arrange the following in order of increasing volume.
$$1$$. Tidal volume 
$$2$$. Residual volume 
$$3$$. Expiratory reserve volume 
$$4$$. Vital capacity
  • $$1 < 2 < 3 < 4$$
  • $$1 < 4 < 3 < 2$$
  • $$1 < 3 < 2 < 4$$
  • $$1 < 4 < 2 < 3$$
The protein $$\alpha-1$$ antitrypsin is used to treat which of the following disease?
  • Cancer
  • Rhematoid arthritis
  • Emphysema
  • ADA deficiency disease in children
Listed are four respiratory capacities (a-d) and four jumbled respiratory volumes of a normal human adult.
Respiratory capacitiesRespiratory volumes
(a)Residual volume$$2500$$mL
(b)Vital capacity$$3500$$mL
(c)Inspiratory reserve volume$$1200$$mL
(d)Inspiratory capacity$$4500$$mL
Which one is correct matching?
  • (c) $$1200$$mL, (d) $$2500$$mL
  • (d) $$3500$$mL, (a) $$1200$$mL
  • (a) $$4500$$mL, (b) $$3500$$mL
  • (b) $$2500$$mL, (c) $$4500$$mL
Choose the right sequential phenomena during passage of $$O_2$$ from blood to tissues.
P. Absorption of $$CO_2$$ by blood
Q. Reaction of $$CO_2$$ with water forming $$H_2CO_3$$ inside RBCs and then $$H^+$$ and $$HCO_3$$ ions.
R. Reaction of $$CO_2$$ with water forming $$H_2CO_3$$ inside plasma followed by conversion into $$H^+$$ and $$HCO_3$$ ions.
S. Combination of $$H^+$$ with haeme part of $$HbO_2$$ to release $$O_2$$.
T. Combination of $$HCO_3$$ with haeme part of $$HbO_2$$ to form reduced haemoglobin and release of $$O_2$$.
  • P.R.S.
  • P.Q.T.
  • P.Q.S.
  • P.R.T.
With conscious efforts one can.
  • Breathe out air totally without oxygen
  • Breathe in and out by moving diaphragm alone without moving ribs at all
  • Breathe out air through eustachian tube by closing both nose and mouth
  • Empty the lungs completely by breathing out all air out of them
Match the columns and find the correct combination.
III
(a)Larynx(p)Lid of larynx
(b)Trachea(q)Air sacs
(c)Alveoli(r)Voice box
(d)Epiglottis(s)Wind pipe
(t)Common passage
  • a-r, b-s, c-q, d-p
  • a-r, b-t, c-q, d-p
  • a-r, b-s, c-p, d-q
  • a-r, b-s, c-q, d-t
What is correct about human respiration?
  • About 90% of $$CO_2$$ is carried by haemoglobin as carbaminohemoglobin
  • Neural signals from pneumotaxic centre of pons can increase duration of inspiration
  • Workers in grinding and store breaking industries may suffer from lung fibrosis
  • Cigarette smoking leads to inflammation of bronchi
Which structure of lungs is directly involved in $$O_2/ CO_2$$ exchange between air and blood capillaries?
  • Bronchi
  • Trachea
  • Alveoli
  • Secondary bronchi
_____ projects obliquely upwards behind the tongue and the hyoid bone, pointing dorsally.
  • Epiglottis
  • Glottis
  • Larynx
  • Pharynx
What are correct about control of Broca's area ?
1.Breathing 
2.Movement of vocal cords
3.Movement of teeth
4.Movement of tongue
  • 1, 2, 3 correct
  • 1, 2 correct
  • 2, 4 correct
  • 1, 3 correct
Hypophysial portal system is present in
  • Frog
  • Rabbit
  • Humans
  • All the above.
Lung alveoli are characterised by.
  • Squamous epithelium
  • Absence of cilia
  • Surfactant secreting cubical cells
  • All the above
Direct respiration occurs in.
  • Human beings
  • Prawn
  • Insects
  • Fish
Which of the following binds irreversibly with haemoglobin?
  • Carbon dioxide
  • Oxygen
  • Carbon monoxide
  • Nitrogen
When $$CO_{2}$$ concentration in blood increases breathing becomes
  • Shallower and slow
  • There is no effect on breathing
  • Slow and deep
  • Faster and deeper
What is the total oxygen carrying capacity of blood?
  • $$20ml/dl$$
  • $$10ml/dl$$
  • $$25ml/dl$$
  • $$15ml/dl$$
Choose the correct statements with regard to human respiration:
(a) Inspiration is faciliated by contraction of phrenic and internal intercostal muscles
(b) Healthy human can inhale or exhale about $$2000-3000$$ml of air/min
(c) Functional residual capacity represents the volume of left out air in lungs after expiration
(d) Total lung capacity is the total volume of air that would be accomodated in the lunds after forced inspiration.
  • a, c
  • b, d
  • c, d
  • a, b
What would happen if human blood becomes acidic?
  • Oxygen carrying capacity of haemoglobin increases
  • Oxygen carrying capacity of haemoglobin decreases
  • RBC count increases
  • RBC count decreases
If the number of alveoli in an individual is doubled without changing the total alveolar volume, the gas exchange capacity of the lungs will see which of the following changes?
  • Increase for both $$O_2$$ and $$CO_2$$
  • Decrease for both $$O_2$$ and $$CO_2$$
  • Remain unaltered for both $$O_2$$ and $$CO_2$$
  • Increase for $$O_2$$ and decrease for $$CO_2$$
Both simple diffusion and facilitated diffusion.
  • Transport molecules only along the concentration gradient and do not use energy
  • Transport molecules only along the concentration gradient by the use of energy
  • Transport molecules against the concentration gradient and do not use energy
  • Transport molecules against the concentration gradient by the use of energy
The protein $$\alpha 1$$- antitrypsin is used to treat the disease.
  • Cancer
  • Rheumatoid arthritis
  • Alzhelmer's disease
  • Emphysema
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