Name the following parts of a tooth :

1. Part exposed above the gum.
2. The hard substance making the covering of the tooth.
3. The soft connective tissue contained in the central space of the tooth.
4. Bone-like structure fixing the root in position.
5. Slight constriction between the root and the crown.

Mention if the following statements are true or false:

1. Saliva moistens and lubricates food.
2. Saliva contains a protein-digesting enzyme.
3. Saliva tends to destroy germs in the mouth.
4. Peristalsis occurs through all regions of the gut.
5. The food in stomach stays for about 10 hours.
6. Gastric juice is alkaline.
7. Gastric juice contains pepsinogen.

Mention if the following statements are true (T) or false (F)

1. Intestinal villi have a lymph vessel called lacteal.
2. Intestine is narrow for fast movement of food.
3. Large intestine secretes no enzymes.
4. Bile neutralizes the acid content of the food received from the stomach.
5. Pancreatic juice has enzymes to digest all the major components of food.
6. The anus is surrounded by circular muscles.

Name the following :

1. The three subdivisions of the small intestine.
2. The three subdivisions of the large intestine.