Transcript TOPIC: Nutrition AIM: What are the parts & functions of the Digestive

Topic: Nutrition
Aim: Explain nutrition & the 2 types of
digestion
Do Now: Protists Questions
HW: Coloring Activities due Monday.
(Cut out five food labels of foods you eat
regularly. Bring them in by Wednesday.)
Review:
1. Ameba ingest large pieces of food by the process of
_______.
2. Once food is ingested by a paramecium, the food is
surrounded by a _________.
3. A paramecia uses ________ for movement and
capturing food.
4. The process which moves cytoplasm around the
protist is known as _______.
5. Some protists remove excess water with the help of
_______.
6. Paramecia expel wastes through the ____.
http://www.youtube.com/watch?v=8sjAf1o1I9Y
Nutrition • When organisms
take in & use
materials needed for
energy & all life
processes
2 types of 1.Autotrophic
nutrition
Nutrition: produce
food from
substances taken
from the
environment
• Examples of autotrophs:
Plants, Algae (Photosynthesis)
2. Heterotrophic nutrition:
• Organisms must ingest food
already made in the
environment
• 3 processes involved in
heterotrophic nutrition:
–Ingestion: take IN food
–Digestion:
breakdown of
food
–Egestion:
removal of
undigested food
(solid waste)
Mechanical • Large pieces of
food are broken
Digestion
down into smaller
pieces
• Increases surface area of food
to speed up chemical digestion
• Example: Teeth
Chemical
Digestion
• COMPLEX
molecules (carbs,
proteins, lipids)
are broken down
into smaller
molecules
• HOW? By using digestive
enzymes
• Carbohydrates  simple sugars
(glucose)
• Proteins  amino acids
• Lipids  glycerol and fatty acids
Review:
1. During nutrition, explain what the
substances taken from the environment
are used for.
2. Explain the difference between
autotrophic and heterotrophic nutrition.
3. Explain the difference between
mechanical and chemical digestion.
4. Where does mechanical digestion occur
in our bodies? Chemical digestion?
Identify the type of nutrition and digestion that is
being described.
1. Food is broken down into smaller pieces.
2. Organisms make their own food.
3. Carbohydrates are broken down into simple
sugars.
4. Increases surface area for chemical digestion.
5. Proteins are broken down into amino acids.
6. Teeth are used to break down food.
7. Enzymes are used.