BIO 431 - UNIT 2 LECTURE EXAM QUESTIONS WITH COMPLETE SOLUTIONS

BIO 431 - UNIT 2 LECTURE EXAM
QUESTIONS WITH COMPLETE
SOLUTIONS
Partial Pressure gradient for CO2 (External respiration)
{Blood entering lungs/Alveolar} - Answer--Blood entering lungs PCO2: 45mmHg
-Alveolar PCO2: 40mmHg

Partial Pressure gradient for O2 (Internal respiration)
{Arterial blood/tissues} - Answer--Arterial blood PO2: 100mmHg
-Tissue PO2: 40 mmHg

Partial Pressure gradient for CO2 (Internal respiration)
{Arterial blood/tissues} - Answer-Arterial blood PCO2: 45mmHg
Tissue PCO2: 40mmHg

Explain ventilation-perfusion coupling cycle - Answer-

How much oxygen is typically unloaded at the tissues at rest? - Answer-23%

What factors can cause in increase in the delivery of oxygen? - Answer--Blood pH
-Temperature
-PCO2

O2-Hb saturation curve - Answer-

3 methods for transporting CO2: - Answer--dissolved CO2 travels in plasma (~7-10%)
-chemically bound to Hb as carbaminohemoglobin (~20%)
{CO2 + Hb ⇌ HbCO2}
-As bicarbonate ions (HCO3-) (~70%)

Primary method for CO2 transport: - Answer-Bicarbonate ions.

Bicarbonate ion equation - Answer-CO2 + H2O --> H2CO3 --> H+ + HCO3-

Bohr effect: - Answer--decreased pH in blood = Hb-O2 bond weakens
-increased pH in blood + Hb-O2 bond strengthens

Haldane effect: - Answer--higher Hb-O2 saturation = less CO2 binds to Hb
-lower Hb-O2 saturation = more CO2 binds to Hb