Capillaries:
What Do They Do?  Where Do They Come From?
*** Note: This post contains 2 comics!

Capillaries are tiny blood vessels with very thin walls, which allows gases food, wastes, and many other materials to be exchanged between the blood and other body tissues.  Because capillaries are found almost everywhere on your body, you can easily lose blood with a simple scratch or even a small paper cut.  In other words, wherever you can bleed, that place has capillaries in it.

Wherever you can bleed, that place has capillaries in it

20170429 capillaries pt1
(Click to Enlarge)
20170429 carpillaries pt2
(Click to Enlarge)

Capillaries are really just the tiny branches branched off from larger blood vessels such as veins and arteries.  If you your whole circulatory system like a tree, the arteries and veins are the tree trunks and large branches, while the capillaries are the small branches and twigs.

 

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: Circulatory System

⇒Topic: Capillaries

Additional Information

Ventricle

A ventricle is a chamber of the heart that is responsible for pushing blood out of the heart.  The human heart has two ventricles–1 right ventricle and 1 left ventricle.

Atrium

An atrium is a chamber of the heart that is responsible for receiving blood into the heart.  The human heart has two atria (atria: plural form of atrium)–1 right atrium and 1 left atrium.

Artery

It is one of the two types of large blood vessels.  An artery is a large blood vessel that leads blood OUT OF the heart.

Vein

It is one of the two types of large blood vessels.  A vein is a large blood vessel that leads blood INTO the heart.

Oxygen (O2)

Oxygen is a gas required to most organisms, including humans.  Without oxygen, our tissues will die in a matter of minutes.  We breathe in oxygen.

Carbon Dioxide (CO2)

Carbon dioxide is a gas that is the waste product from metabolic activities.  It has to be removed from our tissues.  We breathe out carbon dioxide.

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