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Olfactory receptors present in ___________ trigger signals to brain.

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Large protein molecules are broken down in ______ of digestive track.

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___________is the strong acid which is secreted during digestion.

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pH of saliva is ___________ in nature.

Fill in the blanks with suitable words given below.

Fluctuation of hormone (A) ______________ levels results in sensation of hunger and motivation of consuming food. When you feel your stomach is full and there is no need of food any more. Another hormone (B) ___________ that gets secreted suppresses hunger. When we take food into the mouth it has to be chewed thoroughly. For this purpose the (C) ____________ muscles help in chewing actions, while the (D) ____________muscles of the jaw moves the jaw up, down, forward and backward during food mastication. The (E) _____________nerve controls the muscles of the jaw. Under the action of (F) ___________________ nervous system Saliva is released by the salivary glands moistens the food to make chewing and swallowing easier. The salivary (G) ________________ in the saliva breaks down the starch into sugars. As a result of chewing the food is transported into the oesophagus by the action of swallowing which is coordinated by the swallowing centre in the (H) ______________ and the (I) ______________. The tongue which is gustatory recognizes the taste and (J) ___________ nerve plays an important role in sensation of taste.

Choose the right ones.

A. leptin, ghrelin gastrin secretin.

B. ghrelin leptin secretin gastrin.

C. deep muscles, surface muscles, circular muscles, striated muscles.

D. surface muscles, deep muscles, neck muscles, long muscle.

E. fifth cranial nerve, second cranial nerve, fifth facial nerve, spinal nerve.

F. central nervous system, peripheral nervous system autonomous nervous system.

G. lipase, surcease, galactase, amy lase.

H. medulla oblongata, cerebrum, 8^th spinal nerve, cranial nerve. 7^th cranial nerve.

I. Pons varolii, brain stem, medulla oblongata, mid brain.

J. 6^th cranial nerve, 5^th cranial nerve, 10^th cranial nerve, optic nerve.