How much of the total oxygen carried by the blood is is normally delivered to th

Question

How much of the total oxygen carried by the blood is is normally delivered to the tissues of the body? 25% 50% 75% 100% Which of the following does NOT help to increase the amount of gases exchanged in the alveoli? large surface area for diffusion alveoli are surrounded by capillaries active transport of gases across alveolar membranes the concentration gradient is large Diffusion of gases from the alveoli into the blood is determined by... summed pressure of all the gases fractional concentration of each individual gas concentration of each individual gas flow rates of the blood passing the alveoli

Explanation / Answer

1. The oxygen carried by blood is delivered to tissues in 2 forms. Among total oxygen 2% is dissolved in plasma of the blood and 98% is bound to the hemoglobin and transported to various tissues. The option 4 is correct.

2. Alveoli are the network of small sacs in the lungs meant for gaseous exchange. The alveoli is surrounded by blood capillaries and the gases are exchanged from alveoli to blood and vice versa through diffusion. The diffusion of gases take place by concentration gradient and the large surface area allows the efficient gases exchange. Gaseous exchange is not an energy requiring process and active transport of gases do not occur. The option 3 is correct.

3. According to Henry's law, the concentration of gas in liquid such as blood is proportional to solubility and partial pressure of the gas. Therefore, the fractional concentration of individual gas determines the diffusion of gases from alveoli to blood. The option 2 is correct.

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