The mere smell or sight of food stimulates hunger. Describe the process in a flow chart.

Explanation

1) The mere smell even the mere sight of delicious food stimulates the hunger.
2) when we smell , the air borne substances get dissolved in the watery film of nasal mucus.
3) The chemoreceptors in nose are otherwise called olfactory receptors which trigger signals in the form of nerve impulses to the brain where smell is defected.
4) The amount of the neurosecretory protein hormone ghrelin in the blood increases as a result of visual stimulation images of food.
5) Hunger contractions start to occur in the stomach due to hunger generating signals that reach the brain.
6) It is believed that the diencephalon in fore brain and valgus nerve (10th cranial nerve ) plays an important role in carrying these signals to brain.
7) Hunger pangs continue up to 30-45minutes.
8) Increase in ghrelin levels results in sensation of hunger and motivation to consume food.