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Explain how the following may impact energy supplied by the body - Leaving Cert Home Economics - Question 5 - 2009
Question 5
Explain how the following may impact energy supplied by the body. (a) Physical activity (b) Environmental factors. Explain the term 'Basal Metabolic Rate (BMR)'.
Worked Solution & Example Answer:Explain how the following may impact energy supplied by the body - Leaving Cert Home Economics - Question 5 - 2009
Step 1
(a) Physical activity
Answer
Physical activity significantly increases the energy supplied by the body. When a person engages in exercise, the body's metabolic rate rises to meet the demand for energy. This elevated energy requirement is primarily sourced from glucose and fat stores. The intensity and duration of the activity directly influence the degree of energy expenditure. For instance, activities such as running require more energy compared to walking, leading to an increase in caloric burn and mobilization of stored energy.
Step 2
(b) Environmental factors
Answer
Environmental factors, such as temperature and altitude, can also impact energy provision. For example, in cold environments, the body expends additional energy to maintain core temperature, causing an increase in caloric requirements. Similarly, at high altitudes, the lower oxygen levels lead to increased energy expenditure during physical activity due to the additional effort needed for respiration.
Step 3
Explain the term 'Basal Metabolic Rate (BMR)'
Answer
Basal Metabolic Rate (BMR) refers to the amount of energy the body requires at rest to maintain vital functions such as breathing, circulation, and cell production. It represents the minimum caloric requirement necessary for sustaining life in a resting state. BMR is influenced by several factors including age, gender, body composition, and hormonal levels. Understanding BMR is crucial as it helps in determining daily caloric needs and aids in managing weight effectively.