What ensures that the lungs expand as the chest wall expands?
ক
ক) Secreted surfactant
খ
খ) Negative pressure between the pleura
গ
গ) Serous liquid secreted by the pleura
ঘ
ঘ) The elastic recoil of the alveolar tissue
ব্যাখ্যা
Negative pressure (suction) causes the visceral pleura to remain in contact with the parietal pleura, so that when the chest wall & parietal pleura move, the parietal pleura takes the visceral pleura and lungs with it.
২.
The parietal pleura-
ক
develops from splanchnic mesoderm
খ
innervated by phrenic nerve
গ
lines the fissures of lung
ঘ
is insensitive to pain
৩.
Paracentesis thoracis is usually done in the-
ক
Eigth intercostal space
খ
Seventh intercostal space
গ
Ninth inercostal space
ঘ
Tenth intercostal space
ব্যাখ্যা
Aspiration of any fluid from the pleural cavity is called paracentesis thoracis It is usually done in the eighth intercostal space in the midaxillary line The needle is passed through the lower part of the space to avoid injury to the principal neurovascular bundle, i e vein, artery and nerve