Elementary Knowledge of Human Body and Its Important Organs NDA Questions

NDA BIOLOGY

Elementary Knowledge of Human Body and Its Important Organs MCQ Questions


13.
Oxyhaemoglobin is formed when haemoglobin binds with:
A.
Carbon dioxide
B.
Oxygen
C.
Carbon monoxide
D.
Nitric oxide
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ANSWER :
B. Oxygen
14.
The 'respiratory centre' that regulates the rate and depth of breathing is located in:
A.
Cerebral cortex
B.
Hypothalamus
C.
Medulla oblongata
D.
Cerebellum
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ANSWER :
A. Cerebral cortex
15.
The normal breathing rate in a healthy adult at rest is approximately:
A.
12–16 breaths/min
B.
25–30 breaths/min
C.
35–40 breaths/min
D.
5–8 breaths/min
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ANSWER :
A. 12–16 breaths/min
16.
Surfactant in the alveoli is produced by which cells?
A.
Clara cells
B.
Alveolar macrophages
C.
Type II pneumocytes
D.
Type I pneumocytes
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ANSWER :
C. Type II pneumocytes
17.
Which gas is the primary stimulus for increased breathing rate?
A.
Rising Oâ‚‚ levels
B.
Rising COâ‚‚ levels (hypercapnia)
C.
Falling Nâ‚‚ levels
D.
Falling Oâ‚‚ levels
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ANSWER :
B. Rising COâ‚‚ levels (hypercapnia)
18.
The pleura is:
A.
A double-layered membrane surrounding the lungs
B.
The muscular partition between chest and abdomen
C.
The cartilaginous rings of the trachea
D.
The air sacs in the lungs
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ANSWER :
A. A double-layered membrane surrounding the lungs