Physiology Review MCQs-I
Nose filters particle greater than .-------- µm -
Small particles less than 10 micrometers in diameter pose the greatest problems, because they can get deep into your lungs, and some may even get into your bloodstream.
Nose offers about -------- % of resistance to airflow
Nose offers about 50% of resistance to airflow in the respiratory system.
Resistance to airflow in the nose increases during viral infections
Volume of respiratory tract starting from nose to the ------- th generation airways is called anatomic dead space.
Volume of respiratory tract starting from nose to the generation-16 airways is called anatomic dead space
Which of the following is FALSE about cells in Alveoli ?
Type II cells are capable of cellular division, giving rise to more type I and II alveolar cells when the lung tissue is damaged.
Type II cells (granulous pneumocytes) in the alveolar wall contain secretory organelles known as lamellar bodies or lamellar granules, that fuse with the cell membranes and secrete pulmonary surfactant.
How the Particles with 2–10 µm in diameter are removed from lungs?
Particles less than 2 µm in diameter reach alveoli where
they are phagocytosed by alveolar macrophages.
Particles with 2–10 µm in diameter are generally
removed by conducting airways.
Particles more than 10 µm in diameter are removed by hairs in the nostrils.
Particles less than 2 µm in diameter reach alveoli where they are phagocytosed by alveolar macrophages.
What will be the behaviour of Diaphragm of paralysed side during inspiration?
Diaphragm of paralysed side moves up rather than coming down during inspiration.
Bucket-handle effect is seen in which rib movement?
Pump-handle effect is exhibited by which ribs?
Pump-handle effect - Upper 4 ribs rotate the sternum in upward and
outward direction by a movement similar to handle of a water-pump .
This mainly increases the vertical diameter of thoracic cage [ anteroposterior diameter also increases to some extent].
During Inspiration Intra pleural pressure becomes-
Intrapleural pressure (relative to atmospheric pressure) during expiration is about –2.5 to –4 mm Hg and during inspiration is about – 6 mm Hg
The volume of the air present in the lungs at the end of maximal inspiration -
The maximum volume of air that can be expired after a maximal inspiratory effort
Forced Vital Capacity
The total volume of air that can be expired with greatest force and speed after a maximal inspiration
This is the maximum volume of air that can be inspired after tidal expiration
Total Lung Capacity
The volume of the air present in the lungs at the end of maximal inspiration