Why We Eat Page Practice questions: page 399, #1,2,4,5

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Presentation transcript:

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

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

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

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

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

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

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.

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

Metabolism Basal metabolic rate: Women: BMR = 655 + ( 9.6 x weight in kilos ) + ( 1.8 x height in cm ) - ( 4.7 x age in years ) x 4.18 Men: BMR = 66 + ( 13.7 x weight in kilos ) + ( 5 x height in cm ) - ( 6.8 x age in years ) x 4.18

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

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 1.725 (very hard exercise/sports & physical job) : BMR x 1.9

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

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