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Year 1 Body Systems > Respiratory Physiology > Flashcards

Flashcards in Respiratory Physiology Deck (126)
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What is the problem with free diving in terms of oxygen delivery to the tissues?

As dive the lungs compress so although the volume of air decreases the pressure rises so you have sufficient PiO2
When you rise the volume increases and pressure decreases, the FiO2 has decreased aswell as you used some oxygen thus with both those factors PiO2 can decrease greatly
Main problem with free diving is severe hypoxia on ascent


When does decompression sickness (bends/staggers/creeps) occur?

Too rapid decrompression of the body causes nitrogen bubbles to form in the tissues of the body as N2 comes out of solution in the tissues
Can causes pain in the muscles and joints, cramps, numbness, nausea and paralysis


How is decompression sickness treated?

With decompression tanks


How is PiO2 kept normal in deep sea diving?

In deep sea diving as descend atmospheric pressure increases
In order to keep PiO2 normal then a lower FiO2 has to be used


What is hyperoxia and what can it cause?

Cellular oxygen toxicity
Can cause fitting due to free radical generation
Can also cause pulmonary fibrosis/ARDs (acute respiratory distress syndrome)


What is the dive reflex?

Innate reflex of many mammals
Vasoconstriction - O2 conserved to heart lungs and brain
Reflex vagal bradychardia
Suppressed ventilation drive