Inhaled Blood Gases

Question 1

what is the hering breur Reflex?

Answer 1

activating pulmonary stretch receptor prolongs hold times

Question 2

what effect does 100% oxygen have?

Answer 2

silences peripheral arterial chemoreceptors, reduces the drive to breathe, longer breath hold times.

Question 3

what effect does 12.5% oxygen have?

Answer 3

activates peripheral arterial chemoreceptors, increases the drive to breathe, shorter breath hold times.

Question 4

what effect does 95%/5% have?

Answer 4

hyperopia silences arterial chemoreceptors 5% CO2 activates central chemoreceptors
hard to predict, hyperoxic longer times, hypercapnic shorter times …….

Question 5

What happens if you breathe too little or too much?

Answer 5

Chemoreceptor systems work together to give an integrated response.

Question 6

what does the breath in before holding breath do?

Answer 6

this activates pulmonary stretch receptors and the Hering-Breuer reflex to inhibit inspiration and prolong hold time.

Question 7

what effect does CO2 have?

Answer 7

silences the peripheral chemoreceptors but activates the central chemoreceptors. The antagonistic effects show that carbon dioxide sensitivity is important too. The effect on breath hold duration is hard to predict.