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Which one of the following statements regarding the pulmonary circulation is correct?

There is a small nett flow of fluid from the pulmonary capillary bed.

The pulmonary vessels are thin walled because they receive only a proportion of the cardiac output from the right ventricle.

Spasm of the capillaries diverts blood away from poorly ventilated area.

Giving supplemental oxygen improves the reduced Pao2 due to low V/Q units but it does not relieve the arteriolar spasm associated with these units.

Mean pulmonary artery pressure is about 50% of mean systemic arterial pressure.

Which one of the following statements about the pleura is incorrect?

The two pleural cavities do not connect.

During quiet respiration the lungs do not expand fully into the costodiaphragmatic and costophrenic recesses of the pleural cavity.

The parietal pleura is innervated by the intercostal and phrenic nerves and is sensitive to pain and touch.

The visceral and parietal pleura are two discontinuous layers.

Which one of the following statements regarding surfactant is correct?

It is secreted by type 1 pneumocytes.

It decreases lung compliance.

It is soluble in water.

It is present in the foetal lung from 32 weeks.

Which one of the following agents reduces inflammation in asthma?

Salbutamol.

Formoterol.

Ipratropium bromide.

Budesonide.

Salmeterol.

CRL Quiz 1 Sample 1