Multiple Choice
A lack of surfactant can, without treatment, lead to respiratory distress syndrome in premature infants.
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7. Energy and Metabolism
Introduction to Metabolism
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Which of the following is the major role of leptin in the body?
A
Stimulation of insulin secretion
B
Regulation of appetite and energy balance
C
Facilitation of glucose uptake into cells
D
Breakdown of fatty acids in mitochondria
Verified step by step guidance1
Understand the role of leptin: Leptin is a hormone primarily produced by adipose (fat) tissue. Its main function is to regulate energy balance by inhibiting hunger, which in turn helps to maintain body weight.
Eliminate incorrect options: Leptin does not directly stimulate insulin secretion, facilitate glucose uptake into cells, or break down fatty acids in mitochondria. These processes are regulated by other hormones and enzymes, such as insulin and lipase.
Focus on the correct function: Leptin communicates with the hypothalamus in the brain to signal satiety (feeling full) and reduce food intake. It also plays a role in increasing energy expenditure.
Relate leptin to energy balance: By regulating appetite and energy expenditure, leptin helps maintain a balance between the energy consumed (through food) and the energy used by the body.
Conclude the major role: Based on the above analysis, the major role of leptin is the regulation of appetite and energy balance, which aligns with the correct answer provided.
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