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The Digestive System Contd

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For food to move through the digestive pathways it must undergo changes. ... Milk, Cheese, Yoghurt) (eg. Bread, Creal, Pasta, Rice) Dairy. Protein ... – PowerPoint PPT presentation

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Title: The Digestive System Contd


1
The Digestive System Contd
2
A Closer Look at the Digestive Organs
  • Tongue
  • Stomach
  • Intestines

3
Understanding Enzymes
  • For food to move through the digestive pathways
    it must undergo changes.
  • These changes would not be possible without the
    presence of enzymes.
  • Enzymes ensure that the changes occur at an
    appropriate rate.
  • As a result our body functions effectively in a
    timely manner.
  • Enzymes are biological catalysts

4
Reconstruct the Digestive System
  • Break Bread into four pieces
  • Put into plastic zip lock bag
  • Add water
  • Mechanically break bread
  • Add powder enzyme
  • Continue to breakdown the bread
  • Pour through chux cloth
  • Pour through sponge
  • Shape the remaining material

5
Nutrition and Exercise
  • Our bodies work hard for us what can we do to
    look after them?

6
Create Your Own Food Pyramid
Fats, Oil, Sweets
Protein
Dairy
(eg. Meat, Poultry, Fish, Egg, Beans)
(eg. Milk, Cheese, Yoghurt)
Fruit
Vegetable
Carbohydrate
(eg. Bread, Creal, Pasta, Rice)
7
Nutrition
8
Food, Energy and Exercise
  • We need food for energy.
  • Our body uses energy to function.
  • The way our body uses this energy is called
    metabolism
  • We can measure how much energy we use for normal
    body functioning and this is called our basal
    metabolic rate or BMR.
  • When we exercise additional energy is needed.
  • This energy initially comes carbohydrates.
  • When our carbohydrates run out the body uses
    fats.
  • Once the fats run out the body uses proteins.
  • Using protein for energy is very dangerous
    because it breaks down our bodies, so we need to
    eat enough food including carbohydrates
    especially when exercising.

9
Calculation Your Energy Use in a Day
  • Sitting, watching TV or sleeping
  • x 1.2 x (hours/24)
  • Classroom and homework
  • x 1.5 x (hours/24)
  • Walking home from school, walking the dog,
    chores
  • x 3 x (hours/24)
  • Exercise
  • x 6 x (hours/24)
  • Basal Metabolic rate ( ) the amount of
    energy your body uses to function. This energy is
    used to ensure your heart pumps and your lungs
    expand and other bodily function occur.
  • Male
  • (0.074 x weight (65kg)) 2.754 7.564
  • Female
  • (0.056 x weight (55kg)) 2.989 6.069

BMR
BMR
BMR
BMR
BMR
BMR
BMR
10
An Example Nicoles Energy Balance
Nicole is a young university student. To measure
her BMR we need to calculate how much energy she
uses in day depending on the type of activities
she does using the calculations from the previous
slide. She plays Sport 1.5 hours
BMR x 6 x (1.5/24)
6.069
x 6 x 0.0625 2.2759 She goes to
University 5 hours 6.069 x 1.5 x (5/24)
1.8966 She does Homework 3 hours 6.069 x 1.5 x
(3/24) 1.1379 She eats Eat 1 hour 6.069 x
1.5 x (1/24) 0.3793 She watches TV 1.5 hours
6.069 x 1.5 x (1.5/24) 0.5689 She sleep 12
hours 6.069 x 1.5 x (12/24) 4.5518
ADD them all together 2.2759 1.8966 1.1379
0.3193 0.5689 4.5518 10.81 Multiply by
1000 10.81 x 1000 10 810 Kilo Joules (Joules is
a measure of energy) A elite soccer player uses
about 16 500 KJ per day!
10 810 KJ is Nicoles total energy use for this
day!
11
A Realistic Understanding of Healthy
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