Name the important chemical in the arterial blood that regulates the normal respiration.
Carbon dioxide levels
- What does P50 in oxygen-haemoglobin dissociation curve represent?
PO2 value at which Hb is 50% saturated with oxygen
- What is the normal PO2 for P50?
23 – 26 mm Hg
- Which cranial nerve carries the afferent signals from carotid bodies to the respiratory centre?
The glossopharyngeal nerve (IX cranial nerve)
- In a normal person, which type of hypoxia is manifested at high altitudes?
Hypoxic hypoxia
- What is the normal range of oxygen content in arterial blood?
19 – 20 ml/100 ml
- What is the PO2 in arterial blood?
95 – 100 mm Hg
- What is the effect of hypoxia on haematocrit value?
The haematocrit increases
- Name the sac that completely surrounds the lungs
Pleural sac
- Name the law that operates in the lungs during a respiratory cycle in relation to pressure-volume changes.
Boyle’s law
( UMS, 2008 )
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