Figure 11.6
The appetite hormones
Ghrelin:
Hormone secreted by empty stomach; sends “I’m hungry” signals to the brain.
Insulin:
Hormone secreted by pancreas; controls blood glucose.
Leptin:
Protein hormone secreted by fat cells; when abundant, causes brain to increase metabolism and decrease hunger.
Orexin:
Hunge
r-
triggering hormone secreted by hypothalamus.
PYY:
Digestive tract hormone; sends “I’m
not
hungry” signals to the brain.
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Figure 11.6 Figure 11.6