Organization & Tissues
Body Organization &
Homeostasis
Introduction
Levels of Organization in the Human Body
– Atoms
– Molecules
– Organelles
– Cells
– Tissues
– Organs
– Organ Systems
Organelles
Tiny “organs” found inside the
cell
Examples: Nucleus,
Mitochondria, ER, Ribosome,
Cytoplasm
Cells
Basic unit of structure and function
in a living thing.
The human body contains about 100
trillion cells.
Tissues
What is a tissue?
Group of similar cells that
perform the same function
Tissue
There are FOUR basic types of tissues
in your body.
Muscular Tissue
Nervous Tissue
Connective Tissue
Epithelial Tissue
Tissues in the Human Body
Tissue
Muscle
Nervous
Connective
Epithelial
Function
-Allows Movement
Example
Tissues in the Human Body
Tissue
Muscle
Function
-Allows Movement
Example
-Muscles
-Stomach Wall
Nervous
Connective
Epithelial
Tissues in the Human Body
Tissue
Muscle
Function
-Allows Movement
Example
-Muscles
-Stomach Wall
Nervous
-Allows you to see, think, feel
-Carry messages
throughout the body
Connective
Epithelial
Tissues in the Human Body
Tissue
Muscle
Function
-Allows Movement
Example
-Muscles
-Stomach Wall
Nervous
Connective
Epithelial
-Allows you to see, think, feel
-Spinal Cord
-Carry messages
throughout the body
-Brain
-Nerves
Tissues in the Human Body
Tissue
Muscle
Function
-Allows Movement
Example
-Muscles
-Stomach Wall
Nervous
Connective
Epithelial
-Allows you to see, think, feel
-Spinal Cord
-Carry messages
throughout the body
-Brain
-Nerves
-Body framework
-Protects organs
-Connect muscle and bone
-Transport and store nutrients
Tissues in the Human Body
Tissue
Muscle
Function
-Allows Movement
Example
-Muscles
-Stomach Wall
Nervous
Connective
Epithelial
-Allows you to see, think, feel
-Spinal Cord
-Carry messages
throughout the body
-Brain
-Nerves
-Body framework
-Protects organs
-Connect muscle and bone
-Transport and store nutrients
-Red Blood Cells
-Bones -Fat -Blood
-Cartilage -Tendons
Tissues in the Human Body
Tissue
Muscle
Function
-Allows Movement
Example
-Muscles
-Stomach Wall
Nervous
-Allows you to see, think, feel
-Spinal Cord
-Carry messages
throughout the body
-Brain
-Nerves
Connective
-Body framework
-Protects organs
-Connect muscle and bone
-Transport and store nutrients
-Red Blood Cells
-Bones -Fat -Blood
-Cartilage -Tendons
Epithelial
-Protects (skin)
-Absorbs nutrients
-Filters kidneys
Tissues in the Human Body
Tissue
Muscle
Function
-Allows Movement
Example
-Muscles
-Stomach Wall
Nervous
-Allows you to see, think, feel
-Spinal Cord
-Carry messages
throughout the body
-Brain
-Nerves
Connective
-Body framework
-Protects organs
-Connect muscle and bone
-Transport and store nutrients
-Red Blood Cells
-Bones -Fat -Blood
-Cartilage -Tendons
Epithelial
-Protects (skin)
-Absorbs nutrients
-Filters kidneys
-Lining of Digestive Syst.
-Lining of the Mouth
-Skin
Organs & Organ Systems
A structure that is made up of
different kinds of tissues is an
ORGAN
Examples of Organs
Stomach, Heart, Brain, Lungs
Body Organs
An organ has a specific job that is more
complex than that of a tissue.
EXAMPLE:
– The heart pumps blood throughout your body
over and over. The heart contains all four
types of tissue, all tissue types contribute to
pumping the blood.
What is an organ system?
Group of organs that work together to
perform a major function.
Different organ systems work together and
depend on one another.
EXAMPLE:
Riding a Bike
-
Use muscular and skeletal system to
steer and push the pedals.
-
Use your nervous system to direct your
arms and legs to move and balance.
-
Use your respiratory, digestive, and
circulatory system to fuel your muscles
with the energy they need.
-
Excretory system removes wastes
produced while your muscles are hard at
work.
All systems of the body work together to
maintain HOMEOSTASIS.
– The process by which an organism’s internal
environment is kept stable in spite of changes
in the external environment.
Homeostasis Example
Body Temperature
When you are hot…
– Sweat
– Hair lays flat
– Blood vessels widen near
surface to release heat
When you are cold…
– Body Shivers
– Hair stands up to trap heat
– Blood vessels constrict near
surface to conserve heat