During inspiration when the diaphragm contracts, the intrapleural pressure becomes_____________?

Related Mcqs:

1. Normal intrapleural pressure during the start of inspiration is _________ mm of Hg?

   A. -2
   B. -5
   C. 0
   D. -7

2. The intrapleural pressure at the end of deep inspiration is ______________?

   A. -4 mm Hg
   B. +4 mm Hg
   C. -18 mm Hg
   D. + mm Hg

3. The cementuoenamel junction is approximately at the level at which the root canal becomes_____________?

   A. Twisted
   B. Curved
   C. Pulp chamber
   D. Lateral canal

4. During the initial part of inspiration, which of the following does not occur ?

   A. Intrapulmonary pressure falls
   B. Intra thoracic pressure rises
   C. Intra-abdominal pressure rises
   D. The partial pressure of O2 in dead space rises

5. Oral diaphragm is formed by_________________?

   A. Mylohyoid muscle
   B. Genioglossus muscle
   C. Buccinator muscle
   D. Orbicularis oris muscle

6. Limitation of inspiration by vagal lung inflation signals is called the______________?

   A. Autonomic reflex
   B. Bainbridge reflex
   C. Herring – Breur reflex
   D. Dynamic stretch reflex

7. Cardiac muscle contracts due to______________?

   A. Extracellular Ca+2
   B. Sarcoplasmic ca+2
   C. Extracellular Na+
   D. Intracellular Na+

8. Inadequate pressure application during flasking_______________?

   A. Increases vertical dimension
   B. Causes teeth to be shrunken in investment
   C. Causes poor quality of colour
   D. Causes fracture of denture

9. Increase in partial pressure of CO2 leading to release of oxygen to the tissues is________________?

   A. Haldane effect
   B. Bohr effect
   C. Breur effect
   D. Hamburger effect

10. Energy expenditure during normal breathing____________?

    A. 25% – 50% of total energy spent
    B. 50% -75% of total energy spent
    C. 15% – 20% of total energy spent
    D. 2% – 3% of total energy spent