7.2 Energy

• Biologie
• Middelbare school
• havo, vwo
• Leerjaar 2

7.2 Planning

Learning objectives

Instruction

- energy

- BMI

- Fats and sugars

Work/homework

7.2 Energy

You will learn what and how much you have to eat in order to get enough energy.

Which body part uses the most energy at night?

1. Heart
2. Brain
3. Liver
4. Muscles

Which body part(s) use(s) energy when
you are studying for a test.

1. The muscles
2. The brain
3. The muscles as well as the brain

When you ride your bike you use ... energy than when you ride the bus.

1. More
2. Less

You get energy from..

1. Minerals and water
2. Minerals and carbohydrates
3. Carbohydrates and fats
4. Water en fats

Energy

Energy: Necessary for processes of life, activity and to stay warm. 

Released during respiration (verbranding) of energy-rich nutrients such as glucose. 

Carbohydrates and fats

Exercising

Carbohydrates are more easily digested than fats. 

Eating a lot of fat just before exercising is not very sensible

The unit kilojoule

The amount of energy is expressed in the unit kilojoule (kJ):

1 kilojoule is 1,000 joules. 

The energy is often stated in kilocalorie (kcal) as well: 

1 kcal equals 4.2 kJ

1 kJ equals 1:4.2 kcal

The amount of energy you need depends on three things. 

• Activity: the more active you are, the more kilojoules your body consumes.
  
• Age: adults need more energy than small children.
  
• Gender: males consume more energy than females

Who uses more energy-rich nutrients?

1. A two year old child.
2. An eight year old child.

Body Mass Index

BMI (Body Mass Index) = a method to determine if your weight is healthy.

Overweight

Underweight

What is cholesterol?

Why a moderate-fat diet?

 Cholesterol = a fatty substance that your body uses to produce new cells.

Too many fatty foods -- cholesterol accumulate blood vessels -- blood vessels become narrower -- high blood pressure resulting in a heart that wears out faster.

Cholesterol in coronary arteries --> shortage of nutrients and oxygen->heart attack

Why a moderate-sugar diet?

Cariës = A cavity develops when bacteria in your mouth convert sugar into acid. This acid attacks the dental enamel, which dissolves the softer dentine below. The result is a cavity.

What?	Make: All of 7.1 and 1 til 5 of 7.2
How?	In your (online) book. Choose: talking softly or listening to music on your laptop with only one earbud!
Help?	Ask your classmates beside you first, then raise your hand for my assistance
Time?	10-15 minutes
Finished?	Make a summary of 7.1. --> HOW?
Proceeds	You have finished your homework! Well done!

Let's discuss the lesson!

Don't pack your bags yet!

What did you learn today?

When de bell rings:

- Pull up your chairs

- Don't forget your phone