Question

During inspiration the thoracic pressure would _____ which causes the central venous pressure to _____. 1-increase...

During inspiration the thoracic pressure would _____ which causes the central venous pressure to _____.

1-increase : decrease

2-decrease : increase

3-increase : increase

4-decrease : decrease

Science   Anatomy-And-Physiology   
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Answer #1

4 - decrease : decrease.

  • During inspiration , due to contraction  of inspiratory muscles ( which include diphragm to pull downward ) causes increase in volume of thoracic cavity.
  • According to Boyle's law , volume is inversly proportional to pressure.Hence thoracic pressure decreases.
  • Central venous pressure is a measurement of pressure in the venacava .
  • When there occur a decrease in thoracic pressure ,it leads to collapsing of venacava as a result of decreased diameter , there will be  decrease in venous return.Finally decrease in central venous pressure .Hence option 2 in incorrect.
  • Option 1 and 3 are incorrect because during inspiration intrathoracic pressure decreases and increases during expiration
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