1. Lesson 7 Terms and Definitions PART 1
Human Body Systems
Lesson 7 Terms and Definitions
PART 1

2. Q: How do nutrients get from the food you eat to the cells of your body?

3. Absorption
Absorption – process by which nutrients pass through the cells that line the digestive tract.
Humans need lots of nutrients
We need a large surface area to absorb lots of nutrients

4. What increases the surface area?
4 things that increase the surface area of SI
Length
Folds in wall of SI
Villi
Microvilli

5. Length and Folds Length – 6-8 meters long!!!!
Folds in the wall of the Small Intestine

6. Villi and Microvilli
Villi – fingerlike projections in the wall of the SI.
Microvilli – tiny folds in the surface of the individual cells that line the SI.
Smaller pieces of food are absorbed faster!

7. Microvilli
Villi
Folds

8. Folds, Villi, and Microvilli increase the internal surface area 600 times!

9. What goes where? Blood Vessels Amino acids, minerals, vitamins, sugars

10. What goes where? Lymphatic Vessel Fats, fatty acids