ventilatory control Flashcards
what is a-VO2 difference
difference between between arterial and venous side O2
(amount that went inside the cell)
what causes the difference in O2 content of blood leaving the lungs
differences in hemoglobin concentration
what is a-VO2 difference at rest
approx 4-5mL/100mL blood
what is a-VO2 difference during exercise
increases
15-20mL/100mL blood
how does venous O2 content change with exercise
decreases significantly
how does arterial O2 content change with exercise
stays the SAME
due to increased ventilation
where does CO2 come from
produced inside the mito
how is CO2 transported in the blood
dissolved in solution (10% - 5 in plasma and 5 in RBC)
transported as bicarbonate (65%)
carbamino compounds (25% - 5 in plasma and 20 in RBC)
- mostly bound to hemoglobin
what is the law of mass action
adding CO2 pushes the reaction towards bicarbonate
what do buffers do
resist changes in pH (concen of H+)
- pH drops (acid) = absorb H+
- pH increases (base) = release H+
what are the chemical buffer systems
bicarbonate
proteins (hemoglobin and albumin)
phosphate
what are physiological buffer systems
ventilation
- increased ventilation = lower partial pressure of CO2 allowing more to difffuse into the lung and be exhaled
