Oxygen Content, Delivery & Consumption Flashcards Preview

Apex 1 - 2 Respiratory II: Physiology (24) > Oxygen Content, Delivery & Consumption > Flashcards

Flashcards in Oxygen Content, Delivery & Consumption Deck (33)
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1

A measure of how much oxygen is present in 1 deciliter of blood is called:

Oxygen content

2

After oxygen diffuses through the alveolar-capillary membrane, it is transported by the blood in which 2 ways?

  1. Dissolves in the plasma (3%)
  2. Reversibly binds with hemoglobin (97%)

3

The proportion of Oxygen dissolved in the plasma is:

3%

4

The proportion of Oxygen reversibly bond with hemoglobin is:

97%

5

How is arterial O2 content calculated?

CaO2 =

CaO2 =

(1.34 x Hgb x SaO2) + (PaO2 x 0.003)

6

What's the textbook value of CaO2?

CaO2 = 20 mL O2/dL

7

Dissolved 02 is measured by

Pa02

8

PaO2 should be used to:

A. To determine gas exchange in the lungs

B. As a measure of oxygen content in the blood

A. To determine gas exchange in the lungs

9

Which physical law states that the concentration of gas in a solution is directly proportional to the partial pressure of the gas above the solution.

Henry's law

10

Which physical law is used to the concentration of oxygen dissolved in the plasma?

Henry's law

11

The solubility coefficient for oxygen in the plasma is

0.003 mL/ dL /mmHg

12

Oxygen is -----  times less soluble than CO2

 

20 times

13

Most of the oxygen contained in the blood form a reversible bond to

hemoglobin

14

Most of the oxygen contained in the blood form a reversible bond to hemoglobin. The ----------------curve describes the characteristics of this bond

oxyhemoglobin dissociation curve

15

Each gram of hemoglobin can carry ---- mL of molecular oxygen

1.39 mL

16

Each gram of hemoglobin can carry 1.39 ml of molecular oxygen. However, you'll often see 1.34 or 1.32 used instead. Why is that?

Hemoglobin usually contains a small amount of methemoglobin and carboxyhemoglobin

17

Normal Hgb and Hct values for a Male are:

15 g/dL and 45%

18

Normal Hgb and Hct values for a Female are:

13 g/dL and 39%

19

Which variable only tells us how much 02 is contained in the blood (dissolved+ bound to hgb)?

Ca02

20

Which variable tells us how fast a quantity of O2 is delivered to the tissues?

D02

21

How is D02 calculated?

D02 = Ca02  x  Cardiac Output x  10

= ~ 1000 mL 02/min

22

Which part of the D02 equation (D02 = Ca02  x  Cardiac Output x  10) gives us the "how fast a quantity of O2 is delivered to the tissues?

Cardiac Output

(D02 = Ca02  x  Cardiac Output x  10)

23

In the DO2 (D02 = Ca02  x  Cardiac Output x  10) equation, hemoglobin is measured as (unit):

g/dL

24

In the DO2 (D02 = Ca02  x  Cardiac Output x  10) equation, cardiac output is measured as (unit):

 

L/min

25

In the DO2 (D02 = Ca02  x  Cardiac Output x  10) equation, since hemoglobin is measured as g/dL and cardiac output is measured as L/min, we need to convert all of the units to (unit):

Liters

26

In the DO2 (D02 = Ca02  x  Cardiac Output x  10) equation, the number 10 is a conversion factor that accomplishes which goal?

Since hemoglobin is measured as g/dl and cardiac output is measured as L/min, we need to convert all of the units to liters. The number 10 is a conversion factor that accomplishes this goal.

27

Which equation/principle can use to calculate oxygen consumption (VO2)?

Fick principle

28

We can use the Fick principle to calculate oxygen consumption (VO2). It assumes that VO2 is the difference between:

the amount of O2 that leaves the lungs and

the amount of 02 that returns to the lungs

29

We can use the Fick principle to calculate oxygen consumption. It assumes that VO2 is the difference between the amount of O2 that leaves the lungs and the amount of 02 that returns to the lungs.

The difference between these values is:

the amount of 02 that was consumed by the body

30

How is VO2 calculated?

V02 = Cardiac output x (Ca02 - Cv02) x 10