Download Multicellular Organisms - Hicksville Public Schools

Aim: How is life organized?
LEVELS OF ORGANIZATION
• What does the word, organize, mean?
• To put into a certain order
• Given the following items, how would you
organize them and why?
•
• City, state, country, continent
• Why? It goes from small to big
Why do we need to organize in
our lives?
So things can efficiently
work together
Why do living things need to be
organized?
• The twelve organ systems of the human
body need to work together to maintain
homeostasis
_________.
• What is the basic unit of all life?
CELLS
Let’s look at an example of
human organization
• What type of cell do you think we are looking at?
Do we only have 1 muscle cell in
our body?
Cells working together are called
Tissue.
Where do we find muscle tissue?
• Many tissues working together are called
Organs.
How can we combine the different
muscular organs?
• Many organs working together make up
an
organ systems.
ORGANISM
Organisms are comprised of many
integrated organ systems that work
together to maintain a constant stable
internal environment.
Multicellular Organisms
Can you put these in order?
A
Organ
system
B
Tissue
C
Organism
D
E
Cell
Organ
Levels of organization
What system is it?
Nervous Integumentary Skeletal
Muscular Circulatory
What about unicellular organisms?
Unicellular organisms do not have Organ systems, but they
have __________
organelles which are much simpler, but are equally
capable of carrying out metabolic activities.
What is the overall goal of our
organ systems?
The organ systems work together to maintain homeostasis.
In other words, the organ systems maintain an internal
stability despite an always changing environment.
Single-Celled vs. Multicellular:
Function
Gas Exchange
Transport of
Substances
Nutrition
Excretion
Single Cell
Multicellular
Single-Celled vs. Multicellular:
Function
Single Cell
Multicellular
Gas Exchange
Cell membrane
lungs
Transport of
Substances
cytoplasm
Nutrition
Blood,
circulatory
system
Cell membrane Mouth/digestion
Excretion
Cell membrane
Urinary tract
What system is it?
Respiratory
What system is it?
Digestive
What system is it?
Kidney & Bladder
Excretory System
Skin
What system is it?
Immune System
Endocrine System
ATOM
ATOMS ARE THE SMALLEST UNIT
OF MATTER THAT PARTICIPATE IN
CHEMICAL REACTIONS.
Examples: Nitrogen, Oxygen, Phosphorus, Carbon
MOLECULES
Molecules are two or more atoms
that are chemically combined.
Can you guess what
this molecule is?
Hint: It is the most
important molecule
on earth.
What system is it?
Male Reproductive
What system is it?
Female
Reproductive