Tut 1, Function of GIT in digestion and absorption, Biochemistry

 Lecture video 




1. What is the enzyme that breaks down lactose?
A- Lipase enzymes
B- Pepsin
C- Amylase
D- Lactase 

2. Which enzymes are found in the microvilli of the small intestine?
A. Salivary Amylase
B. Brush Border Enzymes
C. Chymotrypsin
D. Pancreatic Amylase 

3. The small intestine can most easily absorb which of the following?
A. Disaccharides
B. Polysaccharides
C. Monosaccharides
D. Starch 

4. Excessive carbohydrates are converted into:
A. fats and proteins
B. fats only 
C. proteins only
D. minerals

5. The component of plants that our stomach cannot digest is:
A. vitamin
B. mineral
C. cellulose
D. centrioles

6. Amylase is an example of an:
A. enzyme
B. hormone
C. gastric juice
D. nutrient

7. What does amylase break down?
A. starch
B. disacharides
C. cellulose
D. lipids

8. In mouth what are polysacharides broken down into?
A. oligosacharides
B. monosacharides
C. glycerol
D. maltose


1- Mention C/P of Lactase and Sucrase deficiency ?

2- Mention Types of absorption and *Gates*? Like Na GULT 1

MCQ answers

1. D
2. B
3. C
4. B
5. C
6. A
7. A
8. A

Mention answers

- abdominal distension
- Abdominal cramps
- Diarrhea
- Acid stool

1- simple diffusion: 
Monosaccharides (fructose, galactose) & pentoses are probably absorbed to some extent via simple diffusion.

2- active transport: ( Na GULT 1 )
Glucose and galactose are transported into the intestinal mucosal cell by Na+ dependent GLUT-1 (glucose transporter -1)

3- facilited diffusion: Na independent ( GULT 5 , GULT 2) 
Fructose enters the intestinal mucosal cell via the Na + independent GLUT5 (glucose transporter 5). Also mannose is transported via GLUT5 . Glucose, fructose & galactose pass from the intestinal mucosal cell to the portal blood via the Na independent GLUT2