For each of the following observations, identify which one these five factors is most important, and briefly explain how/why that is the case.
(a) The ability to sustain aerobic exercise is limited by the amount of haemoglobin in the blood.
(b) Non-starch polysaccharides are large complex carbohydrates, and an important source of dietary fibre. Their chemical energy content is similar to other carbohydrates like sucrose. Why is it that some bacteria can process these molecules but they do not undergo respiration via by human digestion?
(c) Potato is made edible by cooking it.
(d) Digestion is enhanced by chewing our food.
Answer: - Chemical reactions: - (a) The ability to sustain aerobic exercise is limited by the amount of hemoglobin in the blood. Answer: - Reactant concentration. Explanation: - The ability of the cardiorespiratory system (heart, lungs, blood) to deliver oxygen to exercising skeletal muscle constrains. Maximum oxygen consumption, with cardiac output and the concentration of oxygen – carrying Hemoglobin [Hb] being key limiting. (b) Non-starch polysaccharides are large complex carbohydrates and an important source of fibre.
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