1. Living Systems
Focus Question:
What do living organisms need to survive?
Lesson 1-1A

2. Needs of Living Organisms
World is full of living organisms
People are alive
Pets are alive
Trees, grass, flowers, and insects in the
country are alive
Fish, whales, and kelp in the ocean are
alive
Millions of tiny organisms living
everywhere that are too small to see
Life is everywhere

3. Living organisms need things in order
to stay alive.
What are some of the things that all
organisms need?
Talk in your groups and make a list of
needs shared by all organisms.

4. All living organisms need:
Water
Food
Gas exchange (inc. oxygen & carbon
dioxide)
Waste disposal

5. Amoeba
Have you ever heard of an amoeba?
Amoebae are organisms. But they are
different from humans in many ways.
They are tiny. Need a microscope to see a
single amoeba.
They live in water.
An amoeba is made of one cell
Amoeba is an example of a single-
celled organisms. Most of the
organisms on Earth are single-celled
organisms.

6. Amoeba
Single-celled organisms live their whole
lives surrounded by water.
Get food from the water around them.
Use gases dissolved in the water.
Eliminate their waste into the water around
them.
They get everything they need for life
directly from their watery environment.
Turn to page 85 in science textbook

7. Amoeba
Cell membrane surrounds the cell like
skin.
Liquid cytoplasm fill the cell (mostly
water)

8. Elodea
Leaf of water plant – seen through a
microscope
Made of thousands of cells
Each cell looks like a green brick
Multicellular organism
Made of more than one cell
Leaf is only two cells thick, so each cell is
touching the water
Cell membrane surrounds the cell
Cytoplasm fills the cell
Green chloroplasts contain chlorophyll

9. Human Cell Challenge
Humans are multicellular organisms.
Don’t live in water
Made of trillions of cells
Most of the cells are deep inside our
muscles, organs, and bones.
But, every cell is alive.
Every cell is receiving the resources it
needs to survive
Food
Water
Gases
Waste Disposal

10. Human Cell Challenge
How do human cells get the things they
need to survive?
How do they get food?
How do they get water?
How do they get oxygen?
How do they get rid of waste?
Talk in your groups – share your ideas
about the problem of providing for the
needs of the cells

11. Investigation
That beating is called a pulse
Result of blood being pushed through a
blood vessel by the beating of your heart
Every time your heart beats, it pushes a
pulse of blood through the blood vessels
running through your body.
Why is blood being pumped through
blood vessels all over your body?
Ideas -

12. Circulatory System
Open textbook to page 86
Pair/share reading
After reading – complete notebook
sheet “Circulatory System Review”
Answer questions as best as you can
before going back to the text to look up
answers.
Modify our list of ideas, based on
information from the reading.