Ghrelin is secreted primarily by the stomach cells and promotes eating and weight gain. a. true b. false

The answer is true. Ghrelin is produced by ghrelinergic cells of the stomach. When the stomach is empty, the neuropeptide is absorbed into the blood and induces a response from the hypothalamus. The hypothalamus increases the feeling of hunger, appetite, and gastric secretion.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

1. is geographic distribution

2 is increasing complexity

3 is transitional forms