CBSE Questions for Class 11 Medical Biology Breathing And Exchange Of Gases Quiz 3 - MCQExams.com

Acquiring an oxygen debt is evidence that:
  • O$$_2$$ cannot be stored in tissue.
  • Aerobic respiration is more complex than glycolysis.
  • Lactic acid can be converted into glycogen.
  • Anaerobic process is slower than aerobic process.
During single circulation of the blood from lungs to the tissues and back through the circulatory system, the percentage of haemoglobin giving up its oxygen to the tissue is:
  • 50%
  • 25%
  • 75%
  • 80%
Left shift of oxyhaemoglobin curve is noticed under:
  • Normal temperature and pH
  • Low temperature and high pH
  • Low pH and high temperature
  • Low pH and low temperature
A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissue. This $$O_2$$
  • Helps in releasing more $$O_2$$ to the epithelium tissues.
  • Acts as a reserve during muscular exercise.
  • Raises the $$PCO_2$$ of blood to 75 mm of Hg.
  • Is enough to keep oxyhaemoglobin saturation at 96%.
The blood leaving the lungs has all its haemoglobin oxygenated and gives up to the tissue because
  • Tissue can absorb O$$_2$$ from oxyhaemoglobin.
  • O$$_2$$ concentration is lower in tissue than in the lungs.
  • Oxyhaemoglobin undergoes reduction.
  • None of the above.
The function of tracheal hair is to
  • Pass mucus out
  • Pass mucus in
  • Pass air out
  • Pass air in
The function of surfactant is/are
  • Facilitating lung expansion
  • Maintaining the stable size of the alveoli
  • To reduce the surface tension on the alveoli
  • All of the above
In which of the following disease, alveoli are deprived of oxygen due to flattening of tracheal vessels?
  • Bronchitis
  • Asthma
  • Pneumonia
  • Emphysema
Which animal has unpaired lungs
  • Monkey
  • Whale
  • Some frogs
  • Some snakes
Asthma is characterised by
  • Spasm in bronchial muscle
  • Alveolar wall degradation
  • Pain in lungs
  • Damage in diaphragm
Which of the following statements is false?
  • Blood from the right side of the heart is carried to the lungs by the pulmonary artery.
  • The term pleura refers to the double layered covering of the kidney.
  • Pancreas is both an exocrine and endocrine gland.
  • Scurvy is caused by the deficiency of vitamin C.
After taking a long deep breath, we do not respire for some seconds due to
  • More CO$$_2$$ in blood
  • More O$$_2$$ in blood
  • Less CO$$_2$$ in blood
  • Less O$$_2$$ in blood
Blood analysis of a patient reveals an unusually high quantity of carboxyhaemoglobin content. Which of the following conclusions is most likely to be correct?
  • Carbon dioxide
  • Carbon monoxide
  • Carbon disulphide
  • Chloroform
The air which is taken in or given out during a single breath is known as
  • Residual air
  • Vital air
  • Tidal air
  • All of the above
Increased asthmatic attacks in certain seasons are related to?
  • Hot and humid environment
  • Eating fruits preserved in tin containers
  • Inhalation of seasonal pollen
  • Low temperature

Congestion of the lungs is one of the main symptoms in
  • Hypotension
  • Coronary artery disease
  • Angina
  • Heart failure
  • Atherosclerosis
How much amount of air can be inspired or expired during normal breathing?
  • 0.5$$l$$
  • 25$$l$$
  • 1.5$$l$$
  • 5.5$$l$$
'Asthama' is due to
  • Infection of trachea
  • Infection of lungs
  • Bleeding into pleural cavity
  • Spasm in bronchial muscles

Which mammal lacks

true vocal cords
  • Monkey
  • Elephant
  • Hippopotamus
  • Man
Which one of the following statements is incorrect ? 
  • The residual air in lungs slightly decreases the efficiency of respiration in mammals
  • The presence of non-respiratory air sacs, increases the efficiency of respiration in

    birds
  • In insects, circulating body fluids serve to distribute oxygen to tissues
  • The principle of countercurrent flow facilitates efficient respiration in gills of fishes
The figure shows a diagrammatic view of the human respiratory system. The part labelled as 6 is
69895_6d174b4057cc4feb899fa8faadbf130f.png
  • Trachea long tube- supported by complete cartilaginous rings for conducting inspired air
  • Pleural membrane- surrounds ribs on both sides to provide a cushion against rubbing.
  • Alveoli - thin walled vascular bag like structures for exchange of gases.
  • Lower end of lungs diaphragm- which pulls it down during inspiration.
Peritoneal layer of body cavity is made up of
  • Squamous epithelium
  • Ciliated epithelium
  • Columnar epithelium
  • Glandular epithelium
Which of the following is not a water born disease
  • Asthma
  • Cholera
  • Amoebiasis
  • None of these
Artenoid cartilage are found in
  • Hyoid
  • Stemum
  • Larynx
  • Nose

During inspiration  the enlargement of thoracic cage decreases the pressure in the alveoli to about ?
  • -5 mm Hg
  • -8 mm Hg
  • -15 mm Hg
  • None of these

Voice in mammal

produced
  • By syrinx
  • By bronchus
  • During inhalation
  • During exhalation
In man the nasal cavity is separated from the buccal cavity
by a bone which is known as
  • Palatine complex
  • Lingual bone
  • Soft palate
  • Hyoid apparatus
The gas-exchange portion of the human respiratory system is the-
  • Larynx
  • Trachea
  • Bronchi
  • Alveoli
In human, the right lungs has  .............. lobes.
  • 3
  • 4
  • 5
  • 2
During inspiration, muscles of diaphgram
  • Contracts
  • Expands
  • No effect
  • Coiled like string
Which is the correct sequence of air passage during inhalation?
  • Nostrils ---> Larynx ---> Pharynx ---> Trachea ---> Lungs
  • Nasal passage ---> Trachea ---> Pharynx ---> Larynx ---> Alveoli
  • Larynx ---> Nostrils ---> Pharynx ---> Lungs
  • Nostrils ---> Pharynx ---> Larynx ---> Trachea ---> Alveoli
During respiration, exchange of gases take place in
  • Trachea and larynx
  • Alveoli of lungs
  • Alveoli and throat
  • Throat and larynx
In humans the alveoli are the functioning units of external respiration.
  • True
  • False
The correct order of air reaching from atmosphere to the lungs is through
  • External nares, larynx, trachea and air sac.
  • Larynx, trachea, air sac and external nares.
  • Trachea, air sac, external nares and larynx.
  • Air sac, trachea, larynx and external nares.
Rings of .................... present in trachea, bronchi and bronchioles prevent their collapse when air is not passing through them.
  • Cartilage
  • Collagen
  • Bone
  • None of the above.
In respiration, air passes through
  • $$Pharynx \rightarrow nasal \:cavity \rightarrow larynx \rightarrow trachea \rightarrow bronchi \rightarrow bronchioles$$
  • $$Nasal \:cavity\rightarrow Pharynx\rightarrow larynx \rightarrow trachea \rightarrow bronchi\rightarrow bronchioles$$
  • $$Larynx \rightarrow nasal \:cavity\rightarrow Pharynx\rightarrow trachea$$
  • $$Larynx \rightarrow pharynx \rightarrow trachea \rightarrow lungs$$
Lungs become empty after forceful expiration.
  • True
  • False
Maximum contraction of diaphragm causes maximum expiration.
  • True
  • False
Which of the following pairs of reactions occurs most frequently in the blood surrounding the structure shown?
170728_d8cd44a47965424783c6c1d9e618d7ab.png
  • $${Hb+O_2\rightarrow HbO_2 }$$ and $${HHb \rightarrow Hb}$$
  • $${HbO_2 \rightarrow Hb+O_2}$$ and $${Hb + H^+ \rightarrow HHb}$$
  • $${H^{+} + HB \rightarrow HHb}$$ and $${H_2CO_3 \rightarrow HCO_3 +H^+}$$
  • $${CO_2 + H_2 O \rightarrow H_2 CO_3}$$ and $${H_2 CO_3 \rightarrow HCO_3 +H ^ +}$$
Inspiration is initiated by the contraction of?
  • External intercostal muscles
  • Internal intercostal muscles
  • Diaphragm
  • Both a and b
Respiratory distress syndrome occur in patients which lack
  • Larynx
  • Dipalmitoyl lecithin
  • Surfactant
  • Both b and c
In mammals, ventilation movements of lungs are governed by 
  • Muscular wall of lungs
  • Intercostal muscles
  • Diaphragm
  • Diaphragm and intercostal muscles
The ........... checks the entry of food into the respiratory tract.
  • Epiglottis
  • Glottis
  • Tongue
  • Teeth
In respiration air passes through
  • Pharynx, Nasal cavity, Trachea, Bronchi, Bronchiole, Lungs
  • Nasal cavity, Pharynx, Larynx, Trachea, Bronchi, Bronchiole, Lungs
  • Larynx, Nasal cavity, Pharynx, Trachea,Lungs
  • Larynx, Pharynx, Trachea, Lungs
Lungs lie in the thoracic cavity separated by .......... from the abdominal cavity.
  • Diaphragm
  • Ribs
  • Stomach
  • None of the above
Chemical similar to surfactant, glycosaminoglycans of the lungs is released by ---- to protect bronchiole lining.
  • Histiocytes of the lungs
  • Kupffer cells of the liver
  • Clara cells of the lungs
  • None of the above
Conditioning of inspiratory air in mammals occurs in 
  • Trachea
  • Larynx
  • Bronchioles
  • Nasal chambers
Diffusion of the gases is affected at alveolar level in all the following conditions except
  • Emphysema
  • Tuberculosis
  • Lung fibrosis
  • Asthma
Which one of the following is not true for formation of oxyhaemoglobin?
  • pH is around 6
  • Favoured at relatively lower temperature than other body organs
  • High $${pO_2}$$ and low $${pCO_2}$$
  • High $${pO_2}$$ and high haemoglobin
In a resting person, saturation of haemoglobin as blood leaves the tissue capillaries is approximately
  • 75%
  • 40%
  • 3%
  • 46%
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