Physiology- oxygen transport in blood Flashcards
what is cyanosis?
abnormal bluish discolouration of the skin and mucous membranes due to high levels of deoygenated Hb
patient has decreased blood flow and increased oxygen extraction. Which type of cyanosis is most likley?
a. peripheral
b. central
A.peripheral
patient has decreased Hb saturation and abnormal Hb . Which type of cyanosis is most likley?
a. peripheral
b. central
b.central
which law states : the total pressure exerted by the mixture of inert gases is equal to the sum of the partial pressures of individual gases in a volume of air
a. Henrys
b. Ficks
c. Daltons
c.Dalton
which law states : the number of molecules dissolving in a liquid is directly proportional to the partial pressure of the gas
a. Henrys
b. Ficks
c. Daltons
a. Henrys
true or false concentration of gas in a solution is equal to partial pressure
false
solubility of a gas affects its conc
which of these factors is not one of the 3 factors dictating the paO2?
a. alveolar ventilation
b. exertion
c. conc of O2 inspired
d. ventilation perfusion matching
b.exertion
the max amount of O2 that can combine with Hb is known as?
a. partial pressure
b. FiO2
c. oxygen capacity
c. oxygen capacity
what is the correct equation for oxygen saturation?
a. volume of oxygen bound to Hb/ oxygen capacity
b. volume of oxygen bound to Hb x oxygen capacity
c. oxygen capacity/ volume of oxygen bound to Hb
a.volume of oxygen bound to Hb/ oxygen capacity x100 for %
what does saO2 represent?
a. volume of oxygen in arterial blood
b. O2 saturation in arterial blood
a. volume of oxygen in alveolar blood
b. O2 saturation in alveolar blood
b. O2 saturation in arterial blood
what does a pulse oximeter measure ?
a. volume of oxygen in arterial blood
b. O2 saturation in arterial blood
a. volume of oxygen in alveolar blood
b. O2 saturation in alveolar blood
b. O2 saturation in arterial blood
what is the correct oxygen content of one L the blood?
a. 201 ml/l
b. 3ml/l
c. 204 ml/l
d. 150g/l
c. 204 ml/l
201 from o2 bound with Hb
3ml/l in plasma
how much Hb is present in the a litre of blood?
what is the correct oxygen content of one L the blood?
a. 201 ml/l
b. 3ml/l
c. 204 ml/l
d. 150g/l
d.150 g/l
For each g of Hb how much O2 can bind?
a. 1.34 g
b. 1.34 mol
c. 1.34 ml
c.1.34 ml
what is the main role of po2?
a. driving force for saturating Hb with O2
b. transferring O2 out of the blood to the tissue
a.driving force for saturating Hb with O2
Which two factors determine blood oxygen content
a. saO2 and pO2
b. SaO2 and Hb conc
c, pO2 and Hb conc
b. SaO2 and Hb conc
At what point does cyanosis show?
a. more than or equal to 50g/l deoxy Hb or 33% of total Hb
b. when hypoxia begins
c. more than or equal to 50g/l deoxy Hb or 50% of total Hb
a. more than or equal to 50g/l deoxy Hb or 33% of total Hb
Which of these Ox- Hb curves is furthest right ?
a. arterial
b. venous
b.venous
Which of these oxy-Hb dissociation curves has the highest pO50?
a. venous
b. arterial
a.venous
What is the role of 2,3 -DPG?
a. bind oxyhaemoglobin
b. bind deoxyhaemoglobin
c. increase oxygen saturation
d. driving force for saturating Hb with oxygen
b.bind deoxyhaemoglobin
Which blood has a lower po50 on an oxy-Hb dissociation curve?
a. fetal
b. maternal
a.fetal
A blood with a higher O2 affinity will be shifted in which direction?
a. right
b. down
c. up
d. left
d.left
what happens oxygen dissociation curve for anaemia ?
a. right
b. down
c. up
d. left
b.down
oxygen consumption = arterio - venous difference x cardiac output
is referred to by which principle ?
a. Henrys
b. Ficks
c. Daltons
b. ficks principle
