Body Organization and Systems
Overview
Cells
• Cells make up all living things.
• There are different types in your
body, and they are the basic units of
structure and function.
Tissues
• Cells make up tissues, and there are 4 main
types
1.
2.
3.
4.
Epithelial Tissue
Connective Tissue
Muscle Tissue
Nerve Tissue
Epithelial Tissue
• Function – lining inside and outside of the
body
• Examples: skin, organs, mouth
Connective Tissue
• Function: Provides support and structure
• Examples: tendons, ligaments, cartilage,
bone, fat
Muscle Tissue
• Function: Movement, can contract
• Examples: All muscles
Nerve Tissue
• Function: Conducts signals
• Examples: glial cells and neurons
Organs
• Tissues are grouped together to make Organs.
• Organs are made of at least 2 different types
of tissue that work together for a common
purpose.
Organ Examples
• Heart
• Stomach
• Lungs
• Liver
Organ Examples
• Kidney
• Small Intestine
• Brain
• Large Intestine
Organ Examples
• Urinary Bladder
• Spleen
• Pancreas
• Gall Bladder
Skin
• And of course the largest organ in the body,
the skin!
Organs (fill in the letters on your paper)
A. Brain
B. Heart
C. Large Intestine
D. Small Intestine
E. Stomach
F. Kidney
G. Liver
H. Pancreas
I. Gall Bladder
A
G
H
B
E
F
C
D
I
Organs
Systems
• Two or more organs that work together to
perform a specific functions make up different
organ systems that make up your body.
Systems Examples
•
•
•
•
•
Digestive
Excretory
Musculoskeletal
Circulatory
Respiratory
•
•
•
•
•
Integumentary
Endocrine
Nervous
Reproductive
Lymphatic
No system works by itself. They overlap and help each other and
control each one another to make your body run smoothly. In a
sense, they make up one big factory (YOUR BODY!!!).
Digestive System
• Functions: To break
down the food we eat
and absorb the
nutrients in our food.
Excretory System
• Function: To rid the
body of wastes.
Musculoskeletal System
• Function: To give
the body structure,
support, and
movement.
Circulatory System
• Function: To
transport nutrients,
gases, hormones,
and wastes
throughout the
body.
Respiratory System
• Function: To
exchange gases
between the body
and blood and the
environment.
Integumentary System
• Function: To protect
the inside of the
body and maintain
homeostasis (a
stable internal
environment –
temperature, pH,
etc.).
Endocrine System
• Function: To relay
chemical messages
throughout the
body mainly in the
form of hormones.
Nervous System
• Function: To relay
electrical messages
throughout the
body that often
control other organs
and systems.
Reproductive System
• Function: To make
gametes that can
form a new
organism at
fertilization.
Lymphatic System
• Function: To
remove excess
fluids and destroy
internal invaders
(bacteria and
viruses).
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