22) Leptin is secreted by the A) stomach, hypothalamus B) stomach, liver and com
ID: 3446160 • Letter: 2
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22) Leptin is secreted by the A) stomach, hypothalamus B) stomach, liver and communicates a signal to the C) hypothalamus; stomach D) fat cells; hypothalamus E) hypothalamus, fat cells 23) Hereditability estimates of obesity fall in the range of A) 80-90 B) .70-80. C).50-60 D).40-.50. E) Obesity is not generally hereditable. 24) According to Dr. Jeffrey Friedman, 5% of morbid obesity is due to: A) A single gene defect in combination with environmental influences. B) The presence of high-fructose corm syrup in processed foods. C) A single gene defect that causes a deficiency in leptin. D) A single gene defect that causes an insensitivity to leptin. E) Extreme behavioral dysfunction. 25) Homeostasis: A) regulates body temperature, fluids, and metabolism. B) is a negative feedback system. C) involves comparing the current state to a set point. D) is controlled by the hypothalamus. E) all of the above.Explanation / Answer
1. The correct answer is option D. Leptin is a hormone which is released from fat cells in adipose tissue. Leptin signals to the brain particularly to the hypothalamus. It acts to alter food intake and control energy expenditure over the long term.
2. The correct answer is option B. Heritability is a measurement that estimates the proportion of phenotypic variation in a group that can be attributed to genes.
3. The correct answer is option A. Leptin deficinecy acts to alter food intake and control energy expenditure over the long term.
4. The correct answer is option E. Homeostasis is defined as the tendency to resist change in order to maintain a stable,relatively constant internal environment. It typically involves negative feedback loops that counteract changes of various properties from their target values, known as set points.
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