The different systems of the Human Body
What is a Body System?
A body system
is a group of
organs that
work together
to perform a
main body
function
 Nervous System
 Skeletal System
 Muscular System
 Endocrine System
 Digestive System
 Cardiovascular System
 Immune System
 Respiratory System
 Urinary System
 Reproductive System
Nervous System (NOTES)
Central Nervous System
Peripheral Nervous System
Made up of the brain and
the spinal cord
Made up of the nerve
cells that branch out
to the muscles, skin,
internal organs, and
glands
The brain is the
control center of
the body
Protecting the Nervous System
(NOTES)
 To protect the Nervous System:
Wear a protective helmet
 Avoid diving in shallow water
 Wear a seatbelt

Cardiovascular System
 The cardiovascular system transports
nutrients, gases, hormones, and
cellular waste throughout the body
 Biggest duty of the cardiovascular
system is to transport blood (NOTES)
Cardiovascular System (NOTES
IN RED)
 The cardio system consists of 3 parts:
 1. Blood
Red Blood Cells-transport oxygen
 White Blood Cells- prevent infection

 2. Blood Vessels

Arteries, Veins, and Capillaries
 3. Heart – four chambered muscle that
pumps blood throughout the body
Protecting the Cardio System
 To protect the Cardiovascular System:
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Reduce the fat in your diet
Reduce the amount of salt in your diet
Exercise regularly
Avoid tobacco products (can increase blood
pressure)
Maintain a healthy weight
Practice stress management
Skeletal System (NOTES)
 Skeletal system is the framework of
the human body
 206 bones in the human body
 Largest bone is femur
 Protect important organs
Protecting the Skeletal System
 To protect the Skeletal System:
Eat calcium foods
 Use good posture
 Get checked for scoliosis
 Wear proper fitting shoes
 Wear protective gear when playing
sports

Muscular System
 Muscular system consists of muscles that
provide motion and maintain posture
 Speed: slow twitch and fast twitch muscles
 Control: voluntary and involuntary
muscles
 There are 3 main types of muscles: (NOTES)
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Smooth muscles
Skeletal muscles
Cardiac Muscles
Protecting the Muscular System
 To protect the Muscular System:
Stop exercising if injured
 Warm up and stretch before exercise
 Maintain proper weight
 Lift object with knees
 Sleep on a firm mattress

Digestive System
 The digestive system breaks food down into
nutrients that can be used by the body
 The digestive system includes:
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Mouth
Esophagus
Stomach
Small intestine
Large intestine
Liver
 The liver releases bile to breakdown fat, maintain
blood sugar level, and filter wastes
Protecting the Digestive System
 To protect the Digestive System:
Eat slowly
 Eat foods with plenty of fiber
 Practice stress management skills to
avoid indigestion
 Drink plenty of water

Respiratory System
 The respiratory system provides body
cells with oxygen and removes carbon
dioxide that cells produce as waste
 The lungs are main organs of the
respiratory system (NOTES)
Protecting the Respiratory System
 To protect the Respiratory System:
Do not smoke
 Avoid secondhand smoke
 Do not inhale harmful drugs or
chemicals
 Exercise regularly
 Avoid polluted areas

Immune System
 The immune system removes harmful
organism from the blood and fights
pathogens
 White Blood cells plays a huge part of the
immune system (NOTES)
Protecting the Immune System
To protect the Immune System:
-get plenty of rest and sleep
-get plenty of vitamins
-get immunizations
-seek medical help if needed
-exercise
-avoid drugs
Urinary System
 The urinary system removes harmful
liquid wastes from the body and
maintains the body’s water balance
 Consists of the kidneys, Bladder,
Urethra, and Uterus
 DRINK A LOT OF WATER
Endocrine System
 The endocrine system consists of
glands that control many of the body’s
activities by producing hormones
 A hormone is a chemical messenger
that is released directly into the
bloodstream
 Glands include the Pituitary gland,
Thyroid gland, Pancreas, and Adrenal
gland
Protecting the Endocrine System
 To protect the Endocrine System:
Have regular checkups
 Males check for testicular cancer
 Females keep track of menstrual cycle
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Reproductive System