1.2 : 1 : 2 : 3 is the ratio of our dentition. Here 1 represents ___________

2. Large protein molecules are broken down in ____________ of digestive track.

3. ___________ is the strong acid which is secreated during digestion.

4. Olfactory receptors present in __________trigger signals to brain.

5. pH of saliva is _____________ in nature.

6. Fill in the blanks with suitable words given below.

Fluctuation s of hormone (i)__________________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 (ii)____________ that gets secreted suppresses hunger. When we take food
into the mouth it has to be chewed thoroughly. For this purpose the (iii)_____________muscles
help in chewing actions, while the (iv)___________ muscles of the jaw moves the jaw up,
down, forward and backward during food mastication. The (v)_____________ nerve controls
the muscles of the jaw. Under the action of (vi) nervous system Saliva is released
by the salivary glands moistens the food to make chewing and swallowing easier. The salivary
(vii)__________ 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 (viii)_____________ and the (ix)___________. The tongue which is
gustatory recognizes the taste and (x) nerve plays an important role in sensation
of taste.

Choose the right ones.

(i) leptin, ghrelin gastrin secretin.

(ii) ghrelin leptin secretin gastrin.

(iii) deep muscles ,surface muscles ,circular muscles, striated muscles.

(iv)surface muscles, deep muscles, neck muscles, long muscle.

(v) fifth cranial nerve ,second cranial nerve,fifth facial nerve, spinal nerve.

(vi)central nervous system, peripheral nervous system autonomous nervous system.

(vii) lipase, sucrase, galactase,amylase.

(viii) medulla oblongata, cerebrum , 8th spinal nerve,cranial nerve.7th cranial nerve.

(ix)Pons varolii, brain stem ,medulla oblongata, mid brain.

(x) 6th cranial nerve, 5th cranial nerve, 10th cranial nerve, optic nerve.

7.. In which of the following situations you can taste quickly. ( )
A) Put sugar crystals on tongue B) Put sugar solution on tongue.
C) Press the tongue slowly against the palate D) Swallow directly without grinding and shreding