Question at position 10 Leptin and cholecystokinin (CCK) are similar in that they are both associated withlow blood-sugar levels.triggering feelings of hunger.high levels of insulin.decreasing food intake.

Question

BlackTom AI · Accepted Answer

Both leptin and cholecystokinin (CCK) function as satiety signals that reduce food intake.

1. Relevant knowledge points and concepts:
- Leptin is a hormone secreted by adipose tissue that communicates long-term energy stores to the hypothalamus. It inhibits orexigenic neurons (e.g., NPY/AgRP) and stimulates anorexigenic neurons (e.g., POMC/CART), leading to decreased appetite and increased energy expenditure.
- CCK is a gut peptide released by I cells in the duodenum and jejunum in response to fats and proteins during a meal. CCK promotes digestion (pancreatic enzyme secretion, gallbladder contraction) and signals short-term satiety via vagal afferents and central CCK receptors, reducing meal size.
- Satiety signals can act on brain centers (especially the hypothalamus and brainstem) to terminate feeding.

2. Step-by-step reasoning:
- Identify each hormone’s primary behavioral effect: leptin = reduced appetite over the long term; CCK = meal-termination, reduced immediate food intake.
- Determine the commonality: both produce a decrease in eating behavior (i.e., decreasing food intake).
- Evaluate the distractors against these facts.

3. Calculations: not applicable.

4. Why the correct answer is correct:
- Both hormones are well-established anorexigenic signals. Leptin’s central action suppresses hunger and reduces caloric intake chronically. CCK’s peripheral release during meals triggers satiety, causing the person to stop eating sooner. Thus the shared effect is decreasing food intake.

5. Why the other options are incorrect:
- "Low blood-sugar levels.": Low blood glucose generally stimulates hunger, not something leptin or CCK indicate.
- "Triggering feelings of hunger.": This is the opposite of their actions; ghrelin and certain hypothalamic signals trigger hunger, not leptin/CCK.
- "High levels of insulin.": While insulin can have anorexigenic effects, insulin is not the shared primary feature linking leptin and CCK; CCK’s release is meal-driven and not defined by high systemic insulin.

Conclusion: The correct shared property is decreasing food intake, matching the provided answer "decreasing food intake."

Question at position 10 Leptin and cholecystokinin (CCK) are similar in that they are both associated withlow blood-sugar levels.triggering feelings of hunger.high levels of insulin.decreasing food intake.单项选择题

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