transport of oxygen and carbon dioxide (midterm 3) Flashcards
what does O2 move from the alveoli into the blood due to
low O2 partial pressure in the blood and high O2 partial pressure in the alveoli
what is the safety factor of oxygen exchange
most of the oxygen exchange occurs in the first third of the capillary bed to complete CO2 transport
what is the pressure of O2 of blood entering the left atrium and why
95 mmHg (instead of saturated 104) due to the mixing in of unoxygenated blood which has just nourished the lungs
what happens to oxygen during transport from lungs to tissues
97% is carried by hemoglobin and 3% is dissolved in the wter solvent in blood
how much blood carries how much O2 bound to hemoglobin
100 mL of blood carries 20 mL of oxygen bound to hemoglobin (20 volume %)
why does the oxygen-hemoglobin saturation curve shift to the right
- Decreased blood pH
- Increased CO2
- Increased temperature (exercise)
- Increased BPG concentration
