Transport Of Oxygen
Organism gets oxygen from the environment environment diffusion over alveolo-capillary membrane . The latter is important for aerobic metabolism and normal functioning organism .
Oxygen is in the blood bound to hemoglobin → oxyhemoglobin; in dissolved form is his amount minimal .
→ quantity of hemoglobin ( Hb ) in [[ erythrocyte ] ] ech indicates transport the blood 's capacity for oxygen .
- 1 g Hb = 1.39 ml oxygen → 150 g Hb in 1 liter of blood = 200 ml of oxygen → at minute cardiac volume 5 l is therefore 1 L of oxygen transferred for a minute .
- Concentration oxygen we express partial by pressure ( pO 2).
- Saturation Hb oxygen indicates ' saturation . It is expressed in percentages .
- Body an adult a person at peace consumes approx. 250 ml of oxygen / min.
- Quantity of oxygen in the blood = 1.39 x amount Hb vg/lx saturation in %.
Influence bonds of oxygen[edit | edit source]
Custody oxygen on Hb is affected by :
- by temperature ( tissues , environment ),
- Blood pH
- pCO 2,
- → high pCO 2 and decreasing pH decreases affinity Hb to oxygen .
At work tissue is released larger amount of CO2, is formed heat and influence creation acidic substances, the pH is lowered - this all supports release of oxygen from Hb . Custody so there is oxygen addicted on metabolic claims organism , on his consumption .
Increase supplies of oxygen can ensure for normal ones circumstances by increasing ventilation ( increase breath . frequency and volume ) and acceleration Cardiac heart rate action . By influencing these parameters organism compensates increased enjoyment oxygen in tissues .
Increase amount dissolved of oxygen in the blood you can reach hyperbaric oxygen therapy .
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Oxygen transport blood ]]
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