D. Answer the following questions
1 Name the types of teeth found in man State their function
2. State two characteristics of enzymes.
What role does the teeth play in the digestion of food?
State the major functions of saliva,
5. What is the composition of gastric juice?
6. Name the parts of the small intestine and large intestine,
7. What are villi? State their functions.
Answers
D
1.
There are four main types of teeth, and each one has a different shape and function.
The four main types of teeth are:
Incisors - Your incisors are eight teeth in the front center of your mouth (fou8r on both bottom and top). These are typically the first adult teeth that a child will get, coming in when the child is between six and eight years old. Incisors are the teeth that you use to bite into your food.
Canines - Your canines are the next teeth that develop in your mouth. You have four of them and they are your sharpest teeth, used for tearing apart food.
Premolars - Premolars are used for tearing and crushing food. Unlike your incisors and canines, premolars have a flat biting surface. You have eight premolars in total.
Molars - Your molars are your largest teeth. Their function is similar to that of the premolars, to grind, tear, and crush food. Molars have a large flat biting surface which makes them perfect for this job.
These are the four basic types of teeth
D 2. Characteristics of an Enzyme :
1. Speed up chemical reactions.
2. They are required in minute amounts.
D 3. The process of digestion begins in the mouth with the intake of food. The teeth play an important role in masticating (chewing) or physically breaking food into smaller particles.
D 4 .Function of the saliva
a. Chemical digestion: breaks down starch by the function of “salivary amylase”
b. Helps chewing and swallowing
c. Lubricating effect: moisturizes the inside of the mouth and creates smoother speech
d. Solvent effect: dissolves food and allows the tongue to taste food
e. Cleaning effect: washes away food debris and bacteria remaining in the mouth
f. Antibacterial effect: Lysozyme, peroxidase and lactoferrin fight against pathogenic microorganisms
g. pH buffering effect: Prevents sudden changes in pH
h.Supplies minerals, including calcium
and phosphorus, to teeth
D 5. Gastric juice is a unique combination of hydrochloric acid (HCl), lipase, and pepsin.
D 6. The small intestine is divided into the duodenum, jejunum, and ileum.
The large intestine consists of the colon, rectum, and anal canal.
D 7. Villi are small finger-like projections found inside the inner walls of the small intestine. They v increase the surface area for absorption of the digested food. Each villus has a network of thin and small blood vessels close to its surface. The surface of the villi absorbs the digested food materials.
incisor canines premolar molar