<span>The food pyramid gives a simple and visually appealing guideline that enables people to easily see how much of different key food groups they should be eating. It encourages healthy eating but emphasising the smaller quantity of fats and larger quantity of carbohydrates one should eat, for example. It is effective, but the weakness is that food packaging is not always labelled well enough for us to know the exact nutritional content.</span>
The food pyramid gives a simple and visually appealing guideline that enables people to easily see how much of different key food groups they should be eating. It encourages healthy eating but emphasizing the smaller quantity of fats and larger quantity of carbohydrates one should eat, for example. It is effective, but the weakness is that food packaging is not always labelled well enough for us to know the exact nutritional content.
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Answer: Refractory period of the cardiac action potential
Explanation:
Unlike the skeletal muscle which can be reactivated before it reaches a contraction, cardiac muscle must wait before it is almost completely relaxed to be activated again (because of its long refractory period), so one cannot make an increase in strength of contraction with a high frequency of stimulations.
