The Organization of the
Human System
Homeostasis
 Homeostasis is
the regulation of
an organisms
internal, lifemaintaining
conditions despite
changes in the
environment.
Systems
 Systems are groups
of interacting
components that
perform a certain
function.
 Examples: Organ
System, Solar
System, and working
technological parts.
Matter
 Matter is anything
that takes up space
and has mass.
 Examples: Solids,
Liquids, and Gasses.
And pretty much
anything!!!
Atoms
 Atoms are the
smallest basic
particles of matter.
 Examples are
hydrogen atoms,
oxygen atoms, and
nitrogen atoms.
Molecules
 Molecules consist of
two or more atoms
put together.
 Examples: Water
(H20), Carbon
Dioxide (CO2), and
Methane (CH4).
Cells
 Cells are the
smallest basic unit of
life. Cells are the
building blocks of life.
 Examples:
Eukaryotic Cells and
Prokaryotic Cells
Tissues
 Tissues are a group
of cells working
together to perform a
specific function.
 Examples: Muscle
Tissue, Nervous
Tissue (brain, spinal
cord)
Organs
 An organ is two or
more tissues working
together to perform a
specific function in
the body.
 Examples: Heart,
Lungs, Brain,
Kidneys, Eye,
Stomach, Skin, and
Bones.
List of Organs in the
Human Body
 Brain, brain stem, eye, pituitary,
thyroid, heart, lung, esophagus,
appendix, bladder, gallbladder, large
intestine, small intestine, kidney, liver,
pancreas, spleen, skin, stomach,
prostate, testes, ovaries, etc. (and
lots more that are not listed here)
Organ Systems
 System: A group of
interacting
components that
perform a certain
function.
 Example to the left is
the Skeletal System
 Other Examples:
Circulatory System,
Digestive System,
Immune System,
Nervous System, and
Respiratory System.
Organisms
 An organism is an
individual living
system or creature.
 An organism maybe
unicellular or multicellular
 Examples:
Crocodiles, Frogs,
Plants, Bacteria,
Humans, Lizards
Which is the correct order
from smallest to largest?
 A. Tissue, Cell, Organ, Organ System,
Organism
 B. Cell, Tissue, Organ System, Organ,
Organism
 C. Cell, Tissue, Organ, Organ System,
Organism
 D. Cell, Organ, Tissue, Organ System,
Organism
Types of Tissues
 Epithelial Tissue:
Covers and protects
the underlying tissue.
 Example of this is
Skin.
 This type of tissue
also forms the outer
layer of many organs
such as the heart
and lungs.
Types of Tissues
 Nervous Tissue
sends electrical
signals throughout
the body.
 Examples of nervous
tissue are your brain
tissue and spinal
cord tissue.
 There are 45 miles of
nerves in the skin of
a human being.
Types of Tissues
 Muscle Tissue is made of
cells that contract and
relax to produce
movement.
 Your Arms, Heart, and
Stomach have muscle
tissue.
 If all of the muscles that
make up your body could
pull together in one
direction they could pull
something that weighs 25
tons.
Types of Tissues
 Connective Tissue
helps join, supports,
protect, insulate,
nourish and cushion
organs.
Types of Tissues
Organs
 Organ is two or more
tissues working
together to perform a
specific function in
the body.
 Examples: Heart,
Lungs, Brain,
Kidneys, Eye,
Stomach, Skin, and
Bones.
List of Organs in the
Human Body
 Brain, brain stem, eye, pituitary,
thyroid, heart, lung, esophagus,
appendix, bladder, gallbladder, large
intestine, small intestine, kidney, liver,
pancreas, spleen, skin, stomach,
prostate, testes, ovaries, etc. (and
lots more that are not listed here)
Organ Systems
 System: A group of
interacting
components that
perform a certain
function.
 Example to the left is
the Skeletal System
 Other Examples:
Circulatory System,
Digestive System,
Immune System,
Nervous System, and
Respiratory System.
Organ Systems
 Integumentary System
protects tissues and cells
beneath
 So what types of tissues
does the integumentary
system primarily composed
of?
 Most people shed about
600,000 particles of skin
every hour, which amounts
to 1.5 pounds per year.
Within an average lifetime
this means you lose about
105 pounds of skin.
Organ Systems
 Muscular System
helps you move
 Made up primarily of
muscle tissues.
 Muscles are found
nearly every where
throughout your body.
 Any place you can
move or that naturally
moves inside your
body has muscle
Organ Systems
 Skeletal System helps
support and protect body
parts
 Have you ever broken
part of your skeletal
system?
 Your skeletal system
completely replaces
itself every 2 years.
 Skeletal System Video
Organ Systems




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Cardiovascular System
(circulatory system) helps
circulate blood throughout the
body.
Includes the heart, veins, and
arteries.
It pumps oxygenated blood away
from the heart and blood without
oxygen towards the heart.
Red blood cells last about 4
months and travel about 1000
miles in their lifetime.
Video about the Heart
The heart is a strong enough
muscle that if unconstrained by
the body it could pump blood 30
feet in one direction.
Organ Systems
 Respiratory Systems
helps absorb oxygen
and release carbon
dioxide.
 Performs in part the
process of
respiration!
 Respiratory System
Video
Organ Systems
 Urinary System
(Excretory System)
filters or removes waste
products from your body.
 This system filters your
waste products to make
sure you are not getting
rid of needed materials.
 Organs within this
system include in part
your lungs, skin, and
kidneys.
Organ Systems
 Male Reproductive
System produces
sperm needed for
reproduction.
 This organ system
produces sperm for
reproduction.
Organ Systems
 Female Reproductive
System produces
eggs needed for
reproduction.
 This organ system
produces eggs for
reproduction.
Organ Systems
 Nervous System sends
and receives electrical
signals throughout the
body.
 Parts of this organ system
include nerves throughout
your body, your spinal
cord, and your brain.
 These electrical signals
can travel at about
250mph.
 Nervous System Video
Organ Systems
 Digestive System breaks
down food into nutrients
that the body can absorb.
 Your digestive cells are so
acidic they have to replace
themselves every 3 days.
 The cells absorb this
nutrients by diffusion.
 Organs in this system
include your mouth,
esophagus, stomach, small
intestine, and large
intestine.
 Digestive System Video
Organ Systems
 Lymphatic System helps
return leaked fluids to
blood and gets rid of
bacteria and viruses.
 This system is also known
as the immune system that
helps fight off disease.
 The organs that make up
this system are known as
“lymph nodes.” They are
located all over your body
including your chest, neck,
pelvis, armpit, and groin.
 Immune System Video
Organ Systems
 Endocrine System
has glands that help
send out chemical
messages.
 Let’s you know when
your hungry, tired,
etc.
 Organs included in
this system are your
thyroid and your
brain.
Organisms
 Organism is an
individual living
system or creature.
 An organism maybe
unicellular or multicellular
 Examples:
Crocodiles, Frogs,
Plants, Bacteria,
Humans, Lizards
What’s a System?
 A set of inter-related
components working
together to perform a
specific function is a
system.
 A function is a job of
a person or an
object.
 Human System 101
Video
Question #11
 Which of the following statements
describes how tissues, organs, and
organ systems are related?
 A. Organs form tissues, which form
organ systems.
 B. Organ Systems form organs, which
form tissues.
 C. Tissues form organs, which form
organ systems.
 D. None of the Above
Question #12
 The human skeleton has 206 bones.
The human skull has 22 bones. What
percentage of human bones are skull
bones?
 Skull Bones/Skeleton Bones=? Then
take that answer and multiply it by 100
 22/206 X 100/1 = 10.68%
Question #13
 How is the human body
and a car alike?
 Both the human body
and a car contain
several different
systems. A car has an
exhaust system to take
in air and remove waste
products. The human
body has a respiratory
system to take in air and
a digestive system to get
rid of waste products.