CBSE Questions for Class 11 Medical Biology Breathing And Exchange Of Gases Quiz 4 - MCQExams.com

As the $${pCO_2}$$ of the venous blood increases,
  • The concentration of $${HCO^{-}_3}$$ decreases
  • The concentration of $${H^+}$$ in the RBC decreases
  • Hb release $${O_2}$$ more readily
  • The affinity of hb for $${O_2}$$ increases
What is the approximate normal composition of alveolar air?
  • 14% oxygen, 6% carbon dioxide, 80% nitrogen
  • 21% oxygen, 2% carbon dioxide, 77% nitrogen
  • 16% oxygen, 3% carbon dioxide, 81% nitrogen
  • 10% oxygen, 8% carbon dioxide, 82% nitrogen
The alveoli in human lung are 
  • 3 crore
  • 300 million 
  • 350,000
  • 5 lakhs
Membrane separating air in pulmonary alveoli from blood capillaries are _____________.
  • Alveolar epithelium
  • Cardiac epithelium
  • Endothelium blood capillaries
  • Both A and C
With reference to human respiration, which is correct?
  • Pulmonary ventilation is equal to alveolar ventilation.
  • Alveolar ventilation is less than pulmonary ventilation.
  • Alveolar ventilation is more than pulmonary ventilation
  • Pulmonary ventilation is less than alveolar ventilation.
The structures participating in the inhalation are:
  • Diaphragm and internal intercostal muscles
  • Diaphragm and external intercostal muscles
  • Abdominal muscles and intercostal muscles
  • All of the above
Which of the following is a chronic inflammatory disease?
  • Asthma
  • Acapnia
  • Oligopnea
  • Hypoxia
Which of the following statements is not true? 
The partial pressure of
  • Oxygen in deoxygenated blood is 40 mm Hg
  • Oxygen in deoxygenated blood is 95 mm Hg
  • Oxygen in alveolar air is 104 mm Hg
  • Carbon dioxide in the alveolar air is 40 mm Hg
Pick the correct match.
List IList II
AERVp2400 ml
BTVq3000 ml
CIRVr500 ml
DFRCs1100 ml
t1000 ml
  • A-s,B-r,C-q,D-p
  • A-p,B-s,C-q,D-t
  • A-t,B-r,C-p,D-s
  • A-s,B-r,C-q,D-t
Scavenger cells of alveoli is called as
  • Melanophage
  • Monocytes / macrophage
  • Dust cell
  • Microglial cell
A large proportion of oxygen is left unused in the human blood even after its uptake by the body tissues. 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%.
During inspiration, which of the following condition takes place?
  • Thoracic volume increases
  • Thoracic volume decreases
  • Thoracic volume remains same
  • None of the above
Which of the following statements correctly defines Bohr effect?  
  • Rise in $${P_{50}}$$ with a decrease in pH
  • Decrease in $${P_{50}}$$ indicates increase in $${O_2}$$ affinity.
  • Rise in $${P_{50}}$$ with decrease in pH indicates more $${O_2}$$
  • Rise in $${P_{60}}$$ with a decrease in pH
Which of the following problem leads to acidosis?
  • Hypercapnia
  • Asphyxia
  • Hypocapnia
  • Emphysema
Match the structures with the functional names given under. Choose the answer which gives the correct combination of the alphabets of the two columns.
List IList II
ALarynx1Lid of larynx
BTrachea2Air sacs
CAlveoli3Voice box
DEpiglottis4Wind pipe
5Common passage
  • A- 3, B- 5, C- 2, D- 4
  • A- 3, B- 4, C- 1, D- 2
  • A- 3, B- 4, C- 2, D- 5
  • A- 3, B- 4, C- 2, D- 1
The factor which does not affect the rate of alveolar diffusion is 
  • Solubility of gases
  • Thickness of the membranes
  • Pressure gradient
  • Concentration gradient
  • Reactivity of the gases
Lingula structure originates from
  • Superior side of left lung
  • Superior side of right lung
  • Inferior side of right lung
  • Inferior side of left lung
Any material entering the trachea causes
  • Vomiting
  • Coughing
  • Sneezing
  • Regurgitation
Which one of the following statements is correct?
  • The peripheral chemoreceptors that detect changes in the levels of only oxygen in the blood.
  • Right shift indicates decreased oxygen affinity of haemoglobin allowing less oxygen to be available to the tissues.
  • A decrease in pH shifts the oxygen dissociation curve to the left.
  • A decrease in pH shifts the oxygen dissociation curve to the right.
Larynx is a modified portion of
  • Pharynx
  • Trachea
  • Bronchus
  • Lungs
Alveoli has
  • Yellow fibrous connective tissue.
  • White fibrous connective tissue.
  • Areolar connective tissue.
  • Adipose connective tissue.
Which of the following epithelium is located in the respiratory tract?
  • Ciliated columnar epithelium is located in the respiratory tract.
  • Ciliated squamous epithelium is located in the respiratory tract.
  • Simple cuboidal epithelium is located in the respiratory tract.
  • Ciliated pseudostratified columnar epithelium is located in the respiratory tract.
Which type of connective tissue is present in the wall of bronchioles?
  • White fibrous connective tissue
  • Areolar connective tissue
  • Yellow fibrous connective tissue
  • Reticular connective tissue
Cartilaginous rings in trachea are incomplete at which surface?
  • Dorsal
  • Ventral
  • Lateral
  • Ventrolateral
Respiratory organs of whale are
  • Book lungs
  • Lungs
  • Gills
  • Skin
Wall of alveoli is composed of
  • Simple squamous epithelium
  • Simple cuboidal epithelium
  • Pseudostratified epithelium
  • Simple columnar epithelium
How oxygen enters in blood from alveoli of lungs?
  • Pressure of $$CO_2$$
  • Simple diffusion
  • By Haemoglobin
  • Osmosis
Expiration involves
  • Relaxation of diaphragm and intercostal muscles
  • Contraction of diaphragm and intercostal muscles
  • Contraction of diaphragm muscles
  • Contraction of intercostal muscles
Which one of the following statement is correct?
  • Chest expands because air enters into the lungs.
  • Air enters into the lungs because chest expands.
  • The muscles of the diaphragm contracts because air enters into the lungs.
  • All of the above statements are correct.
Expiratory muscles contract at the time of
  • Deep inspiration
  • Normal inspiration and expiration
  • Forceful expiration
  • Normal expiration
Oxygen in expired air
  • 10%
  • 16%
  • 19%
  • 4%
Larynx open into pharynx by
  • Gullet
  • Glottis
  • Epiglottis
  • None of the above
The combination of oxygen with haemoglobin is called as
  • Oxidation
  • Oxyhaemoglobin
  • Reduction
  • None of the above
"Emphysema" is a condition in which
  • Respiratory centre is inhibited
  • Lots of fluid in the lungs
  • The walls separating the alveoli break
  • Lungs have excess $$O_2$$
Which of the following prevents collapsing of trachea?
  • Muscles
  • Diaphragm
  • Ribs
  • Cartilaginous rings
Each lung is enclosed in a double membrane called as pleura. The membrane which closely covers the lung is
  • Lung pleura
  • Visceral pleura
  • Peritoneal pleura
  • Parietal pleura
Ratio of oxyhaemoglobin and haemoglobin in blood is based upon
  • Oxygen tension
  • Carbon-di-oxide tension
  • Carbonate tension
  • Bicarbonate tension
The long trachea of rabbit contains
  • Buccal cord
  • Thyroid
  • Complete tracheal cartilages
  • Incomplete tracheal cartilages
In man, the structure with a function similar to spiracles of cockroach are
  • Lungs
  • Alveoli
  • Bronchioles
  • Nostrils
If the lungs in thoracic cavity are punctured
  • The lungs get inflated.
  • The man dies as the lungs get collapsed.
  • The breathing rate decreases.
  • The breathing rate increases.
Cartilage of Santorini articulates with
  • Cricoid
  • Arytenoid
  • Thyroid
  • None of the above
The covering of lungs in human is
  • Peritoneum
  • Pericardium
  • Pleural membrane
  • Glission capsuls
Nasal chamber is lined by
  • Olfactory epithelium
  • Glandular epithelium
  • Highly vascularised epithelium
  • All of the above
Asthma is a respiratory disease caused due to?
  • Infection of trachea
  • Infection of lungs
  • Bleeding in pleural cavity
  • Spasm in bronchial muscles
Exchange of gases in man takes place in
  • Trachea
  • Bronchus
  • Alveoli
  • All of the above
In thoracic cavity of man which one is present?
  • Lungs
  • Heart
  • Lungs, heart and stomach
  • Lungs and stomach
In humans, sound is produced by:
  • Pharynx
  • Larynx
  • Bronchus
  • Trachea
In nasal passage, the turbinal bones are present in which of the following groups?
  • In all vertebrates
  • Amphibia
  • Mammals
  • None of the above
Which is correct?
  • Respiratory centres are not affected by $$CO_2$$.
  • In humans vital capacity is just double the expiratory volume.
  • A human lung has $$10^3$$ alveoli.
  • During inspiration the lungs act as suction pump.
Type of cartilages in larynx of rabbit, according to shape, are
  • 1
  • 2
  • 3
  • 4
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