The Muscle That Helps Lungs “Breathe”

The diaphragm is a large sheet of muscle located closely below the lungs, and it controls the lungs’ breathing movements.

Controls the lungs breathing movements

20170504 diaphragm
(Click to Enlarge)

When it is relaxed, it is naturally curved up.  Therefore, the lungs become smaller, relaxed, and exhaling out air.

When it contracts (tenses up), it becomes more flat.  Therefore, the lungs become bigger, stretched-out, and taking air in.  In other words, it causes the lungs to breathe in air.


Next Generation Science Standards:

MS-LS1-3 Use argument supported by evidence for how the body is a system of interacting subsystems composed of groups of cells.

HS-LS1-2 Develop and use a model to illustrate the hierarchical organization of interacting systems that provide specific functions within multicellular organisms.

HS-LS1-3 Plan and conduct an investigation to provide evidence that feedback mechanisms maintain homeostasis.

What Science Does this Comic Teach?

Unit: Anatomy

⇒Chapter: Respiratory System

⇒Topic: Diaphragm

Additional Information

Smooth Muscle

Smooth muscle is one of the 3 types of muscles in the human body, and it specializes in involuntary movements uncontrollable by the human mind.  Therefore, this muscle makes up the body organs–or at least help those organs.  For more information, see this comic: http://owlcomics.com/index.php/2017/03/09/muscle-tissue/

Oxygen (O2)

Most organisms need oxygen to survive–including humans.  Without oxygen, our tissues will die in a matter of minutes.  We breathe in oxygen.

Carbon Dioxide (CO2)

To animals, carbon dioxide is a waste, and it must be removed from the body.  However, plants use this gas to conduct photosynthesis.

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