List and discuss two different theories about the regulation of food intake and the role of signal molecules and the brain.
What will be an ideal response?
The hypothalamus contains two centers that regulate food intake: the feeding center and the satiety center, which
inhibits the feeding center. The glucostatic theory states that glucose utilization by hypothalamic centers regulates
food intake. The lipostatic theory states that signals from the body's fat stores to the brain modulate eating behavior
to maintain a particular weight. Leptin is a protein hormone synthesized in adipocytes and may signal the brain to
halt feeding behavior. Neuropeptide Y is a brain neurotransmitter that appears to be the stimulus for food intake;
this molecule is inhibited by leptin. Ghrelin is a peptide secreted by the stomach that stimulates hunger. Table 22.1
in the chapter summarizes peptides involved in feeding.
You might also like to view...
Explain the pathology and treatment of respiratory distress syndrome in infants.
What will be an ideal response?
The muscle shape that has the capacity to shorten to the greatest degree is
A. pennate. B. straight. C. orbicular. D. unipennate E. multipennate.
The reproductive organ that produces gametes is called a
A) duct. B) gland. C) gonad. D) womb. E) girdle.
The aorta is an example of a(n) ________ artery, the largest arteries in the body.
Fill in the blank(s) with the appropriate word(s).