MDCAT BIOLOGY-Life Processes:Gasesous Exchange (SMART INSTITUTE)

A detailed illustration of the human respiratory system showcasing alveoli, bronchial tubes, and gas exchange processes, with vibrant colors and labels for educational purposes

MDCAT Biology: Gaseous Exchange Quiz

Test your knowledge on the human respiratory system and gaseous exchange processes with our comprehensive MDCAT Biology quiz! Designed for students and biology enthusiasts alike, this quiz includes a variety of questions that cover key concepts and functions of the respiratory system.

Highlights of the quiz:

  • Multiple choice questions focused on gaseous exchange
  • Covers a range of topics including lung structure and respiratory functions
  • Ideal for MDCAT preparation and biology revision
60 Questions15 MinutesCreated by BreathingBird123
01-At normal alveolar ventilation, the respiratory center is stimulated by:
O2 concentration in venous blood
CO2 concentration in arterial blood
CO2 concentration in venous blood
O2 concentration in arterial blood
02-All of the following is lined by with mucous membrane of ciliated epithelium except:
Nasal cavity
Bronchi
Trachea
Bronchioles
03-Oxygenated blood from lungs is carried to the heart by:
Pulmonary arteries
Pulmonary veins
Coronary veins
Pre-cavals
04-In terrestrial mammals, the movements for ventilation are governed by:
Abdominal muscles
Skeletal muscles
Diaphragm
Diaphragm and intercostals
05-Residual volume in the lungs of a human during exercise is:
0.5 L
3-4.5 L
1 L
1.5 L
06-In human beings, CO2 concentration in the inspired and expired air is respectively:
0.0 % and 5.3 %
0.4 % and 5.0 %
0.4 % and 4.0%
0.03% and 4.0%
07-Vocal cords are ..... Bands stretched across the mucous membrane in the glottis.
Two thick edged cartilaginous
Two thin edge muscular
Two thin edge fibrous
Two pairs of thick edge fibrous
08-Air is warmed as it passes through:
Nasal cavities
Trachea
Bronchi
Alveoli
09-WOF diverts food mass away from the opening of larynx?
Esophageal sphincter
Respiratory valve
Epiglottis
Soft palate
10-Lungs are spongy because of presence of millions of:
Bronchi
Parabronchi
Alveoli
Air sacs
11-Surfactant is present in:
Alveoli
Bronchi
Bronchioles
All of above
12-All of the following play a protective role in respiratory passage except:
Macrophages
Hair and mucous
Ciliated epithelium
Lymphocytes
13-Total inside capacity of lungs:
0.5 L
5000 mL
2L
1.5L
14-The decrease in pH blood has ........... Effect on the oxygen carrying capacity of haemoglobin.
Positive
Negative
No effect
First negative than positive
15-Vocal cords are stretched across:
Larynx
Pharynx
Glottis
Bronchi
16-A structure that does not contain cartilage:
Alveolar duct
Alveoli
Alveolar sacs
All of above
17-Smooth muscles are present in all except:
Trachea
Bronchioles
Bronchi
Alveoli
18-It is now estimated that 90 % of lung cancer is caused by:
Air pollution
Genetically
Oncovirus
Smoking
19-Each nasal cavity is divided into ...... Passage ways.
2
3
4
1
20-Nasal cavity is lined with:
Columnar epithelium
Ciliated epithelium
Squamous epithelium
Cuboidal epithelium
21-How many functional pairs of vocal cords are present in humans:
1
2
3
4
22-Trachea lies ......... To oesophagus.
Dorsal
Ventral
Medial
Lateral
23-Return of lymph from lower leg is assisted by:
Lymph nodes
Calf muscles
Veinous valves
Cytokines
24-All are respiratory disorders except:
Pulmonary tuberculosis
Rickets
Emphysema
Lung cancer
25-In heavy smokers, the alveoli become enlarged and damaged which reduces the surface area for the exchange of respiratory gases. This condition is called:
Lung cancer
Asthma
Emphysema
Bronchioles
26-Pigment present in muscles has all characteristics except:
Can bind to four oxygen molecules
Only one polypeptide chain
Single haeme group
Copper is present
27-What is true about haemoglobin:
It is dipeptide and present in RBC
It is present in dissolved state in blood plasma
It is dipeptide in mammals and localized in RBC
It is having Haeme group
28-Rings present in trachea which prevent it from collapsing and keep the air passage way open, are:
O shaped
D shaped
C shaped
G shaped
29-Pleura is a thin membranous sac covers lungs with:
Single layer
Double layer
Triple layer
Pair of double layer
30-How many oxygen molecules can bind to muscle haemoglobin?
2
1
4
8
31-WOF is not carried by haemoglobin?
Oxygen
Carbon dioxide
Bicarbonate
Carbon monoxide
32-WOF incorrectly explains the binding of inorganic component in structures found in erythrocytes?
CO with organic portion of haem
O2 with Fe++ of haem
CO2 with NH2 group of haemoglobin
H+ with COOH group of haemoglobin
33-Partial pressure of O2 in alveolar sacs during inhalation is:
158 mmHg
115 mmHg
Less than 100 mmHg
60 mmHg
34-Percentage of O2 transported through plasma
3 %
70 %
97 %
30 %
35-The process of bringing oxygenated air into contact with a gas exchange surface is:
Ventialtion
Photorespiration
Gas transport
Respiration
36-What is the residual volume of air which always remains inside the lungs of human:
3.5 L
5 L
0.5 L
1.5 L
37-The number of oxygen atoms in haemoglobin are:
4
6
8
12
38-Respiratory system is derived from:
Ectoderm
Mesoderm
Endoderm
None of these
39-The mode of respiration in a mammal is:
Mucosal
Tracheal
Cutaneous
Pulmonary
40-Which is correct sequence of the air passage in man?
Nasal cavity-pharynx-trachea-larynx-bronchi-bronchioles-alveoli
Nasal cavity-pharynx-larynx-trachea-bronchi-bronchioles-alveoli
Nasal cavity-larynx-pharynx-trachea-bronchi-bronchioles-alveoli
Nasal cavity-larynx-bronchi-pharynx-trachea-bronchioles-alveoli
41-Food and air pathways are divided at:
Larynx
Pharynx
Stomach
Esophagus
42-WOF statements is correct?
Inspiration is an active process
Expiration is an active process
Inspiration is a passive process
Both expiration and inspiration are passive processes
43-During expiration, the diaphragm becomes:
Normal
Flattened
Oblique
Dome shaped
44-WOF conditions is responsible for increase in ventilation rate of lungs?
Decrease in O2 content of inhaled air
Decrease in O2 content of exhaled air
Increase of CO2 content in inhaled air
Increase of CO2 content in exhaled air
45-The maximum amount of air that our lung can normally hold is:
Vital capacity
Tidal capacity
Total lung capacity
Pulmonary capacity
46-WOF is capable of carrying oxygen?
Blood
Serum
Lymph
Plasma
47-Which one is mismatched?
Haemoglobin-frog
Haemoglobin-snail
Myoglobin-mollusca
Haemoglobin-man
48-WOF shows maximum solubility in blood plasma?
Oxygen
Nitrogen
Carbon dioxide
Carbon monoxide
49-Carbonic anhydrase is found in high concentration in:
Erythrocytes
Leucocytes
Lymphocytes
Blood plasma
50-During an asthma attack, a person has difficulty in breathing because of the contraction of:
Trachea
Bronchi
Alveoli
Terminal bronchioles
51-Diffusion of respiratory gases is inversely proportional to:
Surface area
Difference in concentration
Thickness of the membrane
Presence of moisture
52-WOF function is not given to air passing through nasal cavity??
Filtration
Moistening
PH adjustment
Temperature
53-A complex cartilaginous structure surrounding the upper end of the trachea:
Larynx
Pharynx
Esophagus
Epiglottis
54-A muscularly controlled cartilage, hinge-like action and serves as a lid which automatically covers the opening of the larynx is called:
Epiglottis
Uvula
Esophageal sphincter
Respiratory valve
55-Opening from nose to throat is closed by:
Epiglottis
Soft palate
Esophageal sphincter
Tongue
56-Cavity bounded by ribs and diaphragm is called:
Abdominal cavity
Pelvic cavity
Thoracic cavity
Pleural cavity
57-Bronchioles are cartilage less tubules having largest diameter of:
1 mm
1 μm
0.1 mm
1 nm
58-Bronchioles are made up mainly:
Connective tissue
Circular smooth muscles
Goblet cells
Endothelial cells
59-Functional units of lungs are:
Alveoli
Air sacs
Bronchioles
Epithelial cells
60-Air sac consist of several microscopic alveoli which are:
Double layered structure
Triple layered structure
Single layered structure
Multi layered structures
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