1. Why We Eat Page 396-399 Practice questions: page 399, #1,2,4,5
Digestion
Why We Eat
Page
Practice questions: page 399, #1,2,4,5

2. Why do we eat? Organisms eat for 2 reasons: To obtain ______________.

3. Nutrients Nutrients are required to:
Build
Repair
Replace
Give an example of each of these for humans.

4. Nutrients All living things require: Carbohydrates Proteins Lipids
Water
Vitamins and minerals

5. Energy
Energy is required for:
3 main reasons: 1. 2. 3.

6. Energy
Metabolism:
The collection of chemical reactions performed by an organism
Catabolism:
Anabolism:

7. Metabolism Metabolic rate:
The rate at which your body uses energy to do work
The higher the rate, the more energy you use and the less energy you store.

8. Metabolism Metabolic rate: What affects your metabolic rate?
What factors make different people have different metabolic rates?

9. Metabolism Basal metabolic rate:
Women: BMR = ( 9.6 x weight in kilos ) + ( 1.8 x height in cm ) - ( 4.7 x age in years ) x
Men: BMR = 66 + ( 13.7 x weight in kilos ) + ( 5 x height in cm ) - ( 6.8 x age in years ) x 4.18

10. Metabolism Basal metabolic rate: Measured in kJ
To convert this to the more common Calorie found on food labels:
1 Cal = 4.18kJ

11. Metabolism Basal metabolic rate: (little or no exercise) : BMR x 1.2
(light exercise/sports 1-3 days/week) : BMR x 1.375
(moderate exercise/sports 3-5 days/week) : BMR x 1.55
(hard exercise/sports 6-7 days a week) : BMR x
(very hard exercise/sports & physical job) : BMR x 1.9

12. Metabolism Average Energy Requirements: Activity Kj/Kg 50Kg 100Kg
Exercise Energy Chart - Kilojoules:
Activity
Kj/Kg
50Kg
100Kg
150Kg
Aerobics (low impact)
10.60
530
1060
1590
Step Aerobics (beginner)
13.36
668
1336
2004
Badminton
13.82
691
1382
2073
Basketball (game)
20.27
1014
2027
3041
Basketball (leisurely)
11.98
599
1198
1797
Bicycling, 15kph
11.52
576
1152
1728
Bicycling, 20kph
18.43
922
1843
2765
Bowling
5.07
253
507
760
Canoeing, 4kph
6.45
323
645
968
Canoeing, 6.5kph
12.44
622
1244
1866
Cross country ski (hard)
30.41
1521
4562
Cross country ski (easy)
14.28
714
1428
2143
Cross country ski (mod)
Dancing
9.22
461
Dancing (slow)
Golfing (walk w/o cart)
Golfing (with a cart)
Handball
21.19
2119
3179

13. Homework Page 398 Page 399 Complete the mini-investigation
#3 (Generate a very rough estimate)