Ch14 Pt3

Question 1

Partial Pressure=

Answer 1

% concentration of gas x total pressure
PO2= .2093 (20.93%) x 760mmHg (sea level)
=159mmHg

Question 2

If saturation drips below 60mmHg at PO2 and 40mmHg at muscle,

Answer 2

Would see decreased saturation and increased disassociation

Question 3

4 Factors which increase O2 extraction at the muscle during exercise (internal respiration), (aVO2), (increase dissociation of oxyhemoglobin):

Answer 3

1. Increase PO2 gradient
2. Increase PCO2
3. Decrease pH (increase acidity)
4. Increase Tempurature (increases oxygen uptake in muscle)

Question 4

What does Increasing the PO2 gradient do?

Answer 4

-increase pressure gradient (blood stream to muscle) from rest to exercise
-decrease % O2 saturation of hemoglobin
-increase O2 disassociation from hemoglobin and more O2 available for muscle

Question 5

What does Increasing the PO2 gradient do?

Answer 5

-increase pressure gradient (blood stream to muscle) from rest to exercise
-decrease % O2 saturation of hemoglobin
-increase O2 disassociation from hemoglobin and more O2 available for muscle

Question 6

2. What does increasing the PCO2 gradient do?

Answer 6

-muscle gives off CO2 into blood, disassociating O2 from hemoglobin
-decrease %O2 saturation
-increase O2 extraction to muscle during exercise

Question 7

What does a decrease in pH levels do?

Answer 7

-decrease % saturation of hemoglobin for PO2 (less carrying capacity)
-increased O2 extraction to muscle during exercise

Question 8

What does increasing temperature do?

Answer 8

-decreased % saturation of hemoglobin for given PO2
-increased O2 extraction to muscle gives off

Question 9

carrying Capacity of O2 affected by: (3)

Answer 9

1. Increase Partial pressure (PO2)= increase carrrying capacity
2. Increase temperature = decrease carrying capacity
3. Decrease pH (high acid concentration)= decrease carrying capacity

Question 10

What is exercise Induced Hypoxemia?

Answer 10

Condition found in endurance athletes which the amount of oxygen carried in arterial blood is severely reduced
-pulmonary system lags behind exxceptional adaptations in CV and MS
-comprises arterial O2 saturation and O2 carrying capacity
-less O2 delivered to muscle

Question 11

Causes of Exercise Induced Hypoxemia

Answer 11

-inequality between ventilation and perfusion
-limitations in oxygen diffusion from RBCs -incomplete diffusion

Question 12

Increase in PCO2 from rest to exercise:

Answer 12

Right shift of the oxyhemoglobin curve

Question 13

Exercise induced Hypoxemia affects:

Answer 13

40-50% of highly trained athletes