This is a Word document with several websites that have internal and external human heart interactives. Flash is required for both websites. One website has a drag and drop interactive of the internal and external heart; the other website is an interactive heart transplant. The students love this! I use this Word document with a drop box, however this is not necessary. I usually have the students complete the activities, snip their results and paste the snip onto the Word doc. Then the doc is dropped to a drop box such as Blackboard or School Space as 'proof' that they've completed the activities. This prevents me from having to run around the classroom checking computers when the students are finished with their activities. I used to do this. I learned the hard way:).
Also, the teacher can simply project the websites to use as a whole class learing activity or group activity. All ways work - these activities are visually stimulating and fun!