How can we help?

You can also find more resources in our Help Center.

DISK Demo

STUDY
PLAY
Artery
a blood vessel that carries blood from the heart to the body
Vein
any of the vascular bundles or ribs that form the branching framework of conducting and supporting tissues in a leaf or other plant organ
Phlebotomy
opening of a vein to diminish the blood supply

Flickr Creative Commons Images

Some images used in this set are licensed under the Creative Commons through Flickr.com.
Click to see the original works with their full license.