Breathing

Question 1

Where are partial pressures of oxygen and carbon dioxide measured from

Answer 1

In arterial blood

Question 2

What is normal saturation of oxygen

Answer 2

95-100%

Question 3

If the PaCO2 is too high what will happen in the blood

Answer 3

The pH of blood decreases

Question 4

If the PaO2 is too low what will happen

Answer 4

Respiration is compromised

Question 5

What is the average rate of PaO2

Answer 5

75-100 mm Hg

Question 6

What is the average rate of PaCO2

Answer 6

38-42 mm Hg

Question 7

How is breathing regulated

Answer 7

Through detecting CO2 levels

Question 8

How is breathing controlled

Answer 8

Through chemical and neural mechanisms

Question 9

What are the steps for the control of breathing

Answer 9

If chemoreceptors detect a drop in pH (increase in CO2)
Signals are sent to respiratory centre
Then back to the diaphragm and intercostal muscles to increase breathing rate

Question 10

What can stretch receptors detect

Answer 10

In the lungs sense over inflation and inhibit inspiration