- Muscle tissueis made up of cells that have filaments that move past each other and
change the size of the cell. There are three types of muscle tissue: smooth muscle,
skeletal muscle, and cardiac muscle. - Nervous tissueis made up of the nerve cells that together form the nervous system.
Nervous tissue is found in nerves, the spinal cord, and the brain.
Groups of Tissues Form Organs
A single tissue alone cannot do all the jobs that are needed to keep you alive and healthy.
Two or more tissues working together can do a lot more. Anorganis a structure made of
two or more tissues that work together. The heart, shown inFigure16.3, is made up of
four types of tissues.
Figure 16.3: The four different tissue types work together in the heart as they do in the
other organs. ( 27 )
Groups of Organs Form Organ
Systems Your heart pumps blood around your body. However, your heart needs to be able
to get blood to and from every cell in your body in order to do its job. So, your heart is
connected to blood vessels such as veins and arteries. Organs that work together form an