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The Different Jobs of Cells
2
Cell Organization
• Many-celled organisms are not just mixedup collections of different types of cells.
• Cells are organized into systems that,
together, perform functions that keep the
organism healthy and alive.
organelle
• Parts of a cell that have a special job
found inside in the cytoplasm
• Ex. nucleus
•
vacuole
•
mitochondria
•
chloroplast
cell
• Smallest unit of life
• Ex. Bone cell, muscle cell, nerve cell, etc.
The Different Jobs of Cells
2
Tissues and Organs
• Cells that are alike
are organized into
tissue (TIH shewz).
• Tissues are
groups of similar
cells that all do
the same sort of
work.
Blood is a Tissue
Tissues
• Ex.
• Blood made of blood cells
• Bone tissue made of bone cells
The Different Jobs of Cells
2
Tissues and Organs
• Different types of tissues working together
can form a structure called an organ
(OR gun).
• The stomach is an organ that includes muscle
tissue, nerve tissue, and blood tissue.
• Other human organs include the heart and
the kidneys.
The Different Jobs of Cells
2
Organs Systems
• A group of organs that work together to do
a certain job is called an organ system.
• Organ systems found
in your body include
the respiratory
system, the
circulatory system,
the reproductive
system, and the
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nervous system.
Organ systems
• Nervous system includes the brain, nerves
and spinal cord
• Respiratory system is the nose, trachea,
and lungs
The Different Jobs of Cells
2
Organs Systems
• Organ systems also work together.
• For example, the muscular system has more
than 600 muscles that are attached to bones.
• The contracting cells of muscle tissue cause
your bones, which are part of the skeletal
system, to move.
organism
• A living thing
• Ex. Humans, trees, grass animals
Smallest to largest-order from
top to bottom
tissue, organ system, cell, organism,
organ, organelle (cell part)
Smallest to largest
Organelle
(cell part)
cell
tissue
organ
Organ system
organism
population
community
ecosystem
biome
biosphere
Section Check
2
Question 2
Which is the correct order of cell organization?
A. cell, tissue, organ system, organ
B. cell, organ, tissue, organ system
C. cell, tissue, organ, organ system
D. tissue, cell, organ, organ system
Section Check
2
Answer
The answer is C. Cells are organized into
systems that, together, perform functions that
keep the organism alive.