The term tissue is used to describe a group of cells found together in the body. Although there are many types of cells in the human body, they are organized into four broad categories of tissues: epithelial, connective, muscle, and...

In this activity, students squeeze a tennis ball to demonstrate the strength of the human heart. Working in teams, they think of ways to keep the heart beating if the natural mechanism were to fail. The goal of this activity is to get...

This lesson covers the topic of human bones and joints. Students learn about the skeleton, the number of and types of bones in the body, and how outer space affects astronauts' bones. Students also learn how to take care of their bones...