Quiz 4 Flashcards
How atmospheric and alveolar air differ in composition
Atmospheric air: ≈ 21% oxygen, ≈ 0.04% carbon dioxide, variable humidity.
Alveolar air: Lower oxygen (14-16%) due to lung gas exchange, higher carbon dioxide (around 5%) from cellular respiration, increased moisture content from gas exchange.
The relative PO2 and PCO2 of inspired air
Relative PO2 of inspired air: approximately 159 mmHg
Relative PCO2 of inspired air: around 0.3 mmHg.
The relative PO2 and PCO2 of expired air
The relative PO2 in expired air: approximately 116 mmHg
The relative PCO2 in expired air: approximately 40 mmHg
The relative PO2 and PCO2 of oxygenated blood
PO2 of oxygenated blood:around 95-100 mmHg
PCO2 of oxygenated blood: approximately 35-45 mmHg
The relative PO2 and PCO2 of deoxygenated blood
PO2 of deoxygenated blood: around 35-40 mmHg
PCO2 of deoxygenated blood: approximately 40-45 mmHg
How gases are transported in the blood. Include O2, CO2, and CO
O2:
Dissolved in plasma as O2 molecules.
Bound to hemoglobin: Majority transported bound to hemoglobin, forming oxyhemoglobin.
CO2:
carried as CO2 and bicarbonate ions (HCO3-)
Bound to hemoglobin: Some binds as carbaminohemoglobin.
CO:
Bound to hemoglobin: high affinity, forms carboxyhemoglobin, reducing oxygen transport efficiency.
Dalton’s Law (formula)
Ptotal= P1 +P2 + P3+ …
Temp and vol constant
Henry’s Law (formula)
C = k P
C = concentration of a dissolved gas
k = Henry’s Law constant
P = partial pressure of the gas
How Dalton’s law to the events of external and internal respiration
Gases move from an area of high pressure to low pressure
How Dalton’s and Henry’s law to the events of external and internal respiration
Dalton’s Law governs respiratory gas exchange.
Gases move according to their partial pressures.
External respiration: oxygen enters blood, carbon dioxide exits lungs.Internal respiration: oxygen moves to tissues, carbon dioxide to blood.
Movement guided by pressure differences.
Gases move from an area of High pressure to an area of low pressure
