Review of the Human Body Systems

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Review of the Human Body Systems

• Created by
• Mrs. Wallace

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Body Systems

• Skeletal System
• Muscular System
• Circulatory System
• Digestive System
• Nervous System

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The Skeletal System

• What would happen if humans didn't have bones?
  You'd be floppy like a beanbag. Could you stand
  up? Forget it. Could you walk? No way. Without
  bones you'd be just a puddle of skin and guts on
  the floor.

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The Skeletal System works with the Muscular
System to move your body

• How do my bones move? With a lot of help. You
  need muscles to pull on bones so that you can
  move. Along with muscles and joints, bones are
  responsible for you being able to move. Your
  muscles are attached to bones. When muscles
  contract, the bones to which they are attached
  act as levers and cause various body parts to
  move.

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The Muscular System

• Muscles are the part of our body that allow us to
  move. They make up almost half of the weight of
  our bodies. They are made up of special
  tissues.When brain gives muscles a signal, those
  tissues can contract, or shorten. The muscles are
  attached to bones by tendons. Tendons pull on the
  bones and cause our limbs to move.

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Pictures of Muscle Types

• Cardiac Muscles
• Skeletal Muscles
• Smooth Muscles

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Smooth Muscles

• Smooth muscles are sometimes also called
  involuntary muscles and they are usually in
  sheets, or layers, with one layer of muscle
  behind the other. You can't control this type of
  muscle. Your brain and body tell these muscles
  what to do without you even thinking about it.
  You can't use your smooth muscles to make a
  muscle in your arm or jump into the air.

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Cardiac Muscle

• The muscle that makes up the heart is called
  cardiac muscle. It is also known as the
  myocardium (say my-uh-kar-dee-um). The thick
  muscles of the heart contract to pump blood out
  and then relax to let blood back in after it's
  circulated through the body.
• Just like smooth muscle, cardiac muscle works all
  by itself with no help from you. A special group
  of cells within the heart are known as the
  pacemaker of the heart because it controls the
  heartbeat.

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Skeletal Muscles

• Skeletal muscles are voluntary muscles, which
  means you can control what they do. Your leg
  won't bend to kick the soccer ball unless you
  want it to.

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Skeletal Muscles

• Together, the skeletal muscles work with your
  bones to give your body power and strength. In
  most cases, a skeletal muscle is attached to one
  end of a bone. It stretches all the way across a
  joint (the place where two bones meet) and then
  attaches again to another bone.

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Skeletal Muscles

• Skeletal muscles are held to the bones with the
  help of tendons (say ten-dunz). Tendons are
  cords made of tough tissue, and they work as
  special connector pieces between bone and muscle.
  The tendons are attached so well that when you
  contract one of your muscles, the tendon and bone
  move along with it.

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Muscular System Song

• Muscles of three types you'll find Skeletal,
  smooth, and the cardiac kind. Skeletal muscles
  come in pairs with the bones youll find them
  there
• Workin together to make you strong, one gets
  short while the other long, like your arm when
  muscles flex, Biceps short and long triceps
• Chorus Your heart is a muscle too, Skeletal type
  working like a smooth, A specialized muscle
  called the cardiac, But your skeletal muscles go
  right up your back If youve ever navigated on
  the Erie Canal
• Voluntary muscles all Striated, the skeletal
  Tendons at the bones connect With the joints so
  they can flex
• Involuntary are the kind That move with no choice
  from your mind Like your stomach with muscles
  smooth And in the walls of blood vessels too
• Click the link to hear music and lyrics

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Fun Facts about Muscles

• You have over 30 facial muscles which create
  looks like surprise, happiness, sadness, and
  frowning.
• Eye muscles are the busiest muscles in the body.
  Scientists estimate they may move more than
  100,000 times a day!
• The largest muscle in the body is the gluteus
  maximus muscle in the buttocks.

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The Circulatory System

• Made up of the heart, blood and blood vessels,
  the circulatory system is your body's delivery
  system. Blood moving from the heart, delivers
  oxygen and nutrients to every part of the body.
  On the return trip, the blood picks up waste
  products so that your body can get rid of them.

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The Circulatory System

• Fun Facts!
• One drop of blood contains a half a drop of
  plasma, 5 MILLION Red Blood Cells, 10 Thousand
  White Blood Cells and 250 Thousand Platelets.
• You have thousands of miles of blood vessels in
  your body. "Bill Nye the Science Guy" claims that
  you could wrap your blood vessels around the
  equator TWICE!
• Keep your heart healthy...it's going to have to
  beat about 3 BILLION times during your lifetime!

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The Digestive System

• When you eat, your body digests the food so your
  cells can use it to make energy.
• Acids and enzymes eat away at the surface of food
  to break it down.
• The small intestine is where food is broken down
  into molecules tiny enough for the body cells to
  use.
• In the villi are tiny tubes that carry blood
  called VESSELS. Food molecules are taken into
  these blood vessels. Once the food is in the
  blood, it can travel all over the body.

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Digestive System

• Fun Facts!
• HOW LONG ARE YOUR INTESTINES? At least 25 feet in
  an adult. Be glad you're not a full-grown horse
  -- their coiled-up intestines are 89 feet long!
• Chewing food takes from 5-30 seconds
• Swallowing takes about 10 seconds
• Food sloshing in the stomach can last 3-4 hours
• It takes 3 hours for food to move through the
  intestine
• Food drying up and hanging out in the large
  intestine can last 18 hours to 2 days!
• In your lifetime, your digestive system may
  handle about 50 tons!!

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The Nervous System

• Made up of your brain, your spinal cord, and an
  enormous network of nerves that thread throughout
  your body, it's the control center for your
  entire body. Your brain uses information it
  receives from your nerves to coordinate all of
  your actions and reactions. Without it, you
  couldn't exist!

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Nervous System

• Fun Facts!
• Did you know that you have more sensory neurons
  in your tongue than in any other part of your
  body?
• Many of the drugs that neuroscientists use to
  study the nervous system are from toxic plants
  and venomous animals such as snakes, spiders,
  snails and pufferfish.
• Human neurons are so small you have to use a
  microscope to see them. However, some neurons can
  be up to three feet long.