Physio final: respiratory part 3

In the LUNGS, large changes in O2 does/does not change hemoglobin saturation.

• does not

• does

At the tissues, large changes in O2 does/does not change saturation of hemoglobin

• does

• does not

in arterial blood, hemoglobin is ____% saturated.

• 75%

• 98%

In venous blood, hemoglobin is ___% saturated.

• 75%

• 98%

venous reserve is oxygen remaining in ____ blood.

• arterial

• venous

increase temp, increased H+, increased CO2, decreased O2 will ____ affinity of hemoglobin for O2.

• decrease

• increase

Answer explanation

Hb will release O2

Hb-O2 bond weakens causing oxygen unloading at metabolically active tissues

• Bohr effect

• Haldane effect

Three ways CO2 is transported

• plasma

• Hb

• bicarb

CO2 binds to which part of hemoglobin?

• Heme

• globin

Oxygen binds to which part of hemoglobin?

• heme

• globin

Answer explanation

it binds to the iron in the heme