colorin respiratory system free worksheet

colorin respiratory system free worksheet

coloring respiratory system free worksheet

kindergarten,1st grade to 6th grade, special learning, homeschooling

The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are the lungs, which carry out this exchange of gases as we breathe.

  • Nose
  • Mouth
  • Throat (pharynx)
  • Voice box (larynx)
  • Windpipe (trachea)
  • Airways (bronchi)
  • Lungs

The upper respiratory tract includes the following:

  • Nose
  • Nasal cavity
  • Sinuses

The lower respiratory tract includes the following:

  • Voice box (larynx)
  • Windpipe (trachea)
  • Lungs
  • Airways (bronchi and bronchioles)
  • Air sacs (alveoli)

Breathing In

We breathe in using a muscle called the diaphragm. It flattens out making our lungs expand and fill with air. When we breathe in, the air gets forced through our nose or mouth, down our windpipe, and into bronchi tubes in our lungs. These bronchi tubes branch out and get smaller and smaller, like the roots or branches of a tree.

Alveoli

No, these aren’t a kind of pasta! At the end of the smallest branches of the bronchi are tiny air sacs called alveoli. These air sacs have a very thin, one cell thick wall that allows oxygen to be passed to red blood cells as they are passing by. There are hundreds of millions of these tiny guys in our lungs.

Breathing Out

The alveoli don’t just pass oxygen to our blood, they also help to clean out waste gas from our blood cells. This waste gas is carbon dioxide.

colorin respiratory system free worksheet

When we need to breathe the carbon dioxide out of our lungs, the diaphragm bows up and pushes the air back out, getting rid of the carbon dioxide. This makes room for fresh air with new oxygen to come back in on our next breath.

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colorin respiratory system free worksheet

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