EXAM III Last of Pulmonary

Question 1

What factors allow the diffusion capacity of oxygen to increase during exercise?

Answer 1

Increased surface area of capillaries participating in diffusion

An ideal V/Q ratio in upper parts of the lungs

Question 2

What factors determine tissue PO2?

Answer 2

Rate of oxygen transport to the tissues

Rate of oxygen consumption by the tissues

Question 3

Define oxygen utilization coefficient; how is it calculated?

Answer 3

Percentage of blood that gives up its oxygen

Question 4

During _____(high or low) PO2, oxygen is bound to Hb (pulmonary capillaries)

During ____(high or low) PO2, oxygen is released from Hb (tissue capillaries)

Answer 4

High

Low

Question 5

What are the 4 factors that shift the oxygen-Hb dissociation curve to the right?

Answer 5

BPG

Increased CO2

Increased [H+]

Increased temperature

Question 6

What is the Bohr effect and what effect does it have on the O2-dissociation curve?

Answer 6

When there is a decreased amount of O2 associated with the Hb and other respiratory compounds in response to a lowered blood pH resulting from an increase in blood [CO2]

Right-shift curve, release of O2

Question 7

What are the 3 ways CO2 is transported in the blood? What are the approx percentages of CO2 that is transported by each mechanism?

Answer 7

Carbonic acid = 70%

Dissolved in blood = 7%

Carbamino Hb = 23%

Question 8

What are the 5 respiratory centers? Where are they located and what are their functions?

Answer 8

D.P.PreB.B.

DRG - tractus solitarius - NTS (nucleus of tractus solitarius) and medulla reticular substance

VRG

PRG (pons) = Apneustic Center and Pneumotaxic Center

Pre-Botzinger complex

Botzinger complex

Question 9

Which respiratory center establishes the ramp signal?

Answer 9

Dorsal Respiratory Group