Because blood entering a systemic capillary network has high concentrations of oxygen and nutrients, these substances move from the blood to the tissue fluid by the process of .
Question
Because blood entering a systemic capillary network has high concentrations of oxygen and nutrients, these substances move from the blood to the tissue fluid by the process of .
Solution
The substances move from the blood to the tissue fluid by the process of diffusion.
Here's a step-by-step explanation:
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Blood enters the systemic capillary network from the arteriole end. This blood has high concentrations of oxygen and nutrients because it is coming directly from the heart, where it was oxygenated and loaded with nutrients in the lungs and digestive system, respectively.
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The walls of the capillaries are very thin and semi-permeable, which means certain substances can pass through them.
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Oxygen and nutrients in the blood are essential for the cells in the tissues. However, the concentration of these substances is lower in the tissue fluid surrounding the cells compared to the blood.
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Due to this concentration gradient (high concentration in the blood and low concentration in the tissue fluid), oxygen and nutrients naturally move from an area of high concentration to an area of low concentration. This process is known as diffusion.
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As a result, oxygen and nutrients diffuse from the blood in the capillaries into the tissue fluid, where they can be used by the cells.
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