This link shows how to make a life-sized human body map. Students trace their own body then make and place their bones and organs within the tracing where they would be inside their actual body. Label, color code, and use texture. This is a great way to teach and assess students' understanding of the human body.
A hands-on science demonstration (and sensory tub idea) to learn what blood is made of! See "What's blood?" on kidshealth.org for background information suitable for kids... modify the shape of the platelets as desired during your demonstration. Great idea!