MODULE 4 UCI BIO E109 EXAM
QUESTIONS WITH VERIFIED ANSWERS
\.Describe how the terms of the ideal gas law may affect the concentration of a
gas in solution. - ANSWERS✔-it determines what factors influence the pressure
since the pressure is what's driving oxygen into solution;
being able to change how much pressure is above the solution, then we can
change how much O2 is driven into the solution;
if we want to maximie the pressure, then we lower the volume (plunger into the
system like a closed volume) drives more O2 into the solution;
PRESSURE & VOLUME ARE FIXED
\.Explain how air pressure changes with a modification on the volume that
contains a fixed number of gas molecules. - ANSWERS✔-if the volume is
decreased, there is more pressure and vice versa
\.Define a 'partial pressure' and explain its importance for exchange. -
ANSWERS✔-partial pressure the proportion of pressure that's generated by one
type of gas;
the partial pressure is a driving force for diffusion into a solution;
depending on how high or how low the PP, it will wither favor diffusion into or out
of the blood;
gas composition of air favors gas exchange into the lungs
, \.Describe how the components of blood chemistry influence the solubility of
oxygen. - ANSWERS✔-the solution in which the O2 is present plays a factor if it'll
favor O2 or not (ex: water tends to hold on to CO2 better than it does to O2.
Plasma is better than water in terms of obtaining O2);
the hemolglobin in the RBC contains iron that have heme groups (really good at
binding to oxygen)
\.Use the oxygen-dissociation curve to explain how O2 solubility changes during
exchange in the lungs and in the cells. - ANSWERS✔-at full air capacity in the lungs
and capillaries, the PP is at 100 mmHg, once the blood gets transported through
the body, the O2 eventually finds its way to capillaries to cells that need it;
oxygenated blood = equilibrium with the air at 100 mmHg
\.Explain the functional significance of the non-linear relationship of the oxygen-
dissociation curve for exchange at the cells. - ANSWERS✔-the non-linear
relationship tells us how much oxygen the cells need- liberates oxygen and gives it
to the cells- the Partial pressure increase in plasma causes the hemoglobin to bind
O2
a linear relationship- any drop in PP would cause the same liberation of O2 instead
of a liberation when the cells need it
\.Describe how the pH, temperature, and PCO2 affect the oxygen-dissociation
curve and why that matters for exchange. - ANSWERS✔-pH- at normal levels is at a
pH of 7.4 but when the body is active, the curve is at pH of 7.2; the lower pH
curve also means that there is a significantly less saturation = more O2 is being
released by the blood to the cells;
blood is less saturated with lower levels of pH and higher levels of CO2/ temp
QUESTIONS WITH VERIFIED ANSWERS
\.Describe how the terms of the ideal gas law may affect the concentration of a
gas in solution. - ANSWERS✔-it determines what factors influence the pressure
since the pressure is what's driving oxygen into solution;
being able to change how much pressure is above the solution, then we can
change how much O2 is driven into the solution;
if we want to maximie the pressure, then we lower the volume (plunger into the
system like a closed volume) drives more O2 into the solution;
PRESSURE & VOLUME ARE FIXED
\.Explain how air pressure changes with a modification on the volume that
contains a fixed number of gas molecules. - ANSWERS✔-if the volume is
decreased, there is more pressure and vice versa
\.Define a 'partial pressure' and explain its importance for exchange. -
ANSWERS✔-partial pressure the proportion of pressure that's generated by one
type of gas;
the partial pressure is a driving force for diffusion into a solution;
depending on how high or how low the PP, it will wither favor diffusion into or out
of the blood;
gas composition of air favors gas exchange into the lungs
, \.Describe how the components of blood chemistry influence the solubility of
oxygen. - ANSWERS✔-the solution in which the O2 is present plays a factor if it'll
favor O2 or not (ex: water tends to hold on to CO2 better than it does to O2.
Plasma is better than water in terms of obtaining O2);
the hemolglobin in the RBC contains iron that have heme groups (really good at
binding to oxygen)
\.Use the oxygen-dissociation curve to explain how O2 solubility changes during
exchange in the lungs and in the cells. - ANSWERS✔-at full air capacity in the lungs
and capillaries, the PP is at 100 mmHg, once the blood gets transported through
the body, the O2 eventually finds its way to capillaries to cells that need it;
oxygenated blood = equilibrium with the air at 100 mmHg
\.Explain the functional significance of the non-linear relationship of the oxygen-
dissociation curve for exchange at the cells. - ANSWERS✔-the non-linear
relationship tells us how much oxygen the cells need- liberates oxygen and gives it
to the cells- the Partial pressure increase in plasma causes the hemoglobin to bind
O2
a linear relationship- any drop in PP would cause the same liberation of O2 instead
of a liberation when the cells need it
\.Describe how the pH, temperature, and PCO2 affect the oxygen-dissociation
curve and why that matters for exchange. - ANSWERS✔-pH- at normal levels is at a
pH of 7.4 but when the body is active, the curve is at pH of 7.2; the lower pH
curve also means that there is a significantly less saturation = more O2 is being
released by the blood to the cells;
blood is less saturated with lower levels of pH and higher levels of CO2/ temp
