Download Levels Of Organization

Levels Of Organization
7.12C- recognize levels of
organization in plants and
animals, including cells, tissues,
organs, organ systems, and
organisms.
Title: Hierarchy of Organization
Complete on page 61
Draw a pyramid like the one below with
13 rows. Place in order the twelve terms
with the smallest term at the bottom of
the pyramid. The terms are as follows:
biosphere, atom, community,
molecule, biome, cell, tissue,
ecosystem, organ, organ system,
organism, population, organelle
Smallest parts of
matter
Recall from 6th grade
science: the smallest
parts of matter are
atoms.
The Latin word atoma
literally means
indivisible
Atoms come together
to form molecules.
These molecules
make up the
organelles or
components of a
cell.
The levels of organization from
simplest to most complex are:
 Cells
 Tissues
 Organs
Organ
System
 Organism

 The
Cells
unit of life and the
basic unit of structure and
function in the human body
 Though all cells perform
the processes that keep
humans alive, they also
have specialized functions
as well.
 Examples may be nerve
cells (neurons), blood cells,
and bone cells.
Tissues
A group of specialized cells that work
together to perform the same function.
 There are four basic types of tissue in
the human body:

Nerve tissue

Muscle tissue

Epithelial tissue

Connective tissue

Tissues
1.
Nerve tissue – carries
impulses back and forth to
the brain from the body
Muscle tissue
tissue – (cardiac, smooth, skeletal)
contract and shorten, making body parts move
 There are 3
types:
 Muscle



Skeletal
Cardiac
Smooth
3. Epithelial tissue – covers the surfaces of
the body, inside (as lining and /or covering
of internal organs) and outside (as layer of
skin)
4. Connective tissue – connects all parts of
the body and provides support (for example
tendons, ligaments, cartilage, and blood).
Organs
 A group
of two or more different types
of tissues that work together to
perform a specific function.
 The task is generally more complex
than that of the tissue.
 For example, the heart is made of
muscle and connective tissues which
functions to pump blood throughout
the body.
Systems
 A group
of two or more organs that work
together to perform a specific function.
 Each organ system has its own function but
the systems work together and depend on
one another.
 There are eleven different organ systems in
the human body: circulatory, digestive,
endocrine, excretory (urinary), immune,
integumentary, muscular, nervous,
reproductive, respiratory, and skeletal.
 All
Organism
of the organ
systems come
together to form an
organism
Population

a group of
organisms of the
same species
Community
 A group
of
organisms of
different species; a
collection of
populations
Ecosystem
 The
biotic and
abiotic components
of an environment
Biome
 A large
geographic area of the same climate
and precipitation; may contain one or more
ecosystems
Biosphere
 The
part of the Earth that supports life