Difussion occurs from a high concentrated region to a low concentrated region. The velocity of diffussion is proportional to the differential of concentrations. In the lung arrives blood with low levels of oxygen while the long is rich with fresh oxygen so the oxygen flows from the lung tissues to the blood.
The other tissues consume oxygen continually them they get poor in oxygen and so the oxygen that is in the blood diffuses to the tissue that is poor in oxygen.
True the heart like any muscle strengthens when you use it
The first one A, Nutrition. Nutrition takes in and uses the food to creat nutrient substances to restore energy, grow, to repair itself, and calories.
Answer: Nutrition.
The minimum amount of aerobic activity that one should engage in is 30
minutes 3 times a week, less than 30 minutes will not be effective.
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