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The Human Body
Systems working together
Humans Have Systems For:
 Movement/Support/Protection
Digestion
Circulation
Respiration
Excretion (Waste Removal)
Control and Coordination
Reproduction
Protection from disease
These systems interact to keep
an organism working properly
and help maintain homeostasis
Movement
The skeletal system and muscular system
work together so humans can move
Why is movement important?
escaping danger
obtaining food and shelter
reproduction
The Skeletal System Also…
Provides protection for
the internal organs
And…
Inside of the bone is
bone marrow which is
where blood cells are
produced
Human Muscular System
More About Muscles…
There are different types of muscles
Skeletal muscle is voluntary (under conscious
control) and moves the bones
Smooth muscle is involuntary (under
unconscious control) and is found in places
like the digestive tract and lines blood vessels
Cardiac muscle is involuntary and is found in
the heart
Check Out The terminator’s
muscular/skeletal system
Digestion
For the mechanical (chewing) and the
chemical breakdown (enzymes) of food
This is necessary so that food can be
absorbed into the body and transported to all
cells
Mouth
Salivary gland
Esophagus
Liver
Gall bladder
Stomach
Pancreas
Small intestine
Large intestine
Anus
Circulatory System
Moves substances to and from cells
This system is necessary to supply needed
materials to the cells and remove cell
products and wastes
Respiratory System
For gas exchange
Supplies oxygen to the body and removes
carbon dioxide
This system is necessary so that cells can
use the oxygen to release the energy stored
Excretory System
Gets rid of all body waste products
Removes excess heat energy
This system is necessary because of the
build up of waste products and poisons in
the cells
Don’t forget, these are also part
of the excretory system!
Control and coordination
The nervous and endocrine systems interact
to control and coordinate the body’s
response to internal and external changes
The response to stimuli
The Nervous System
The central nervous
system (CNS) is your
brain (central control)
and spinal cord (links
the brain to other parts
of the body)
Other nerves provide
the pathways to
muscles, glands and
sense organs
The Endocrine System
• Regulates growth
development and
reproduction through
glands
• Glands produce
hormones – chemical
messengers that affect
other parts of the body