121. Which of the following are the correct statement for respiration in human?
A
Cigarette smoking may lead to inflammation of bronchi
B
Neural signals from pneumotaxic centre in pons region of brain can increase the duration of inspiration
C
Workers in grinding and stone - breaking industries may suffer from lung fibrosis
D
About 90% of carbon dioxide $$\left( {C{O_2}} \right)$$ is carried by haemoglobin as carbamino haemoglobin
Answer :
Workers in grinding and stone - breaking industries may suffer from lung fibrosis
122. Which one of the following organs in the human body is most affected due to shortage of oxygen?
A
intestine
B
skin
C
kidney
D
brain
Answer :
brain
124.
The figure given below shows a small part of human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function?
Options :
A
$$C$$ : arterial capillary - passes oxygen to tissues
B
$$A$$ : alveolar cavity - main site of exchange of respiratory gases
C
$$D$$ : capillary wall - exchange of $${O_2}$$ and $$C{O_2}$$ takes place here
D
$$B$$ : red blood cell - transport of $$C{O_2}$$ mainly
Answer :
$$A$$ : alveolar cavity - main site of exchange of respiratory gases
125. Which forms stable compound with haemoglobin
A
O2
B
CO2
C
CO
D
All of the above
Answer :
CO
126. In lung, maximum gaseous exchange is due to
A
Simple diffusion
B
Active transport
C
Passive transport
D
Only RBC
Answer :
Simple diffusion
127. Which of the following is not a respiratory organ in rabbit
A
Nasal chamber
B
Oesophagus
C
Pharynx
D
Trachea
Answer :
Oesophagus
128. Minimum concentration and pressure of CO in alveoli of lungs that would be dangerous to man
A
1% , 0.7 mm Hg
B
0-4 %, 0-7 mm Hg
C
2-7 %, 0 - 4 mm Hg
D
0 - 3 % , 0 - 4 mm Hg
Answer :
1% , 0.7 mm Hg
129. One of the following is correct statement
A
All animals breathe
B
All animals do not breathe
C
All cells of the body do not respire for energy
D
Tiger salamendar
Answer :
All animals do not breathe
130. Among mammals, the efficiency of ventilation of lungs as compared to reptiles and birds is better developed by the presence of
A
Ribs & costal muscles
B
Only ribs
C
Only costal muscles
D
None of the above
Answer :
None of the above