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...

How do we see what we see? The eye works all day from the moment you wake up to the moment you close them to go to sleep. Let's take a tour of the amazing eye! Included is a video, an article, quiz, activity and word find.

Choose a cell type and go inside to see how its signals travel. The response depends on the type of cell the signal reaches. Cell types include photoreceptor, muscle cell, fibroblast, leaf parenchyma, and cancer.

Practice questions on how muscles rely on lactate dehydrogenase.

Make Sid move to match his father's movements and learn to identify where to find your muscles.

Students learn the structure and function of the cardiac muscle and study the components of the conducting system that distributes electrical impulses through the heart during the cardiac cycle.

A very solid Berkeley site on the structure and function of bird flight. Topics include skeletal and muscular adaptations for flight.

This is a virtual lab that investigates the effects of damage to eye muscles and nerves on the motion of the eyes. This lab is extremely realistic. This activity can be done as a whole class or as a demonstration.

In this interactive tutorial you will discover that the cytoskeleton is both a muscle and a skeleton, and is responsible for cell movement, cytokinesis, and the organization of the organelles within the cell.

Learn about what causes eye twitching and some interesting superstitions in different cultures.

[Free Registration/Login Required] Using video content and assessment integration students will learn about the human muscular system.

A five question multiple-choice quiz over the muscular system. After answers are submitted, students have the opportunity to review the missed questions.

Students learn the structure and function of the descending pathways of the motor commands from the cortex to the skeletal muscles.

This resource provides complete, mini-learning modules about different aspects of the human body. Click on the eyeball to focus your search.

Try this at-home science experiment that shows that crumpling paper is not always as easy as it seems.

This site features a detailed index of photographs for cardiovascular pathology. You can see what a normal human heart looks like and what a sick one looks like too. Come and check it out.

[Free Registration/Login may be required to access all resource tools.] How important is your skeleton? Can you imagine your body without it? You would be a wobbly pile of muscle and internal organs, and you would not be able to move....

Facts about four basic types of tissues in the human body and their functions.