Cells, Tissues, Organs, Systems

The smallest units of human life are called (a)  

• cells
• tissues
• organs
• organisms

Tissues are made up of similar (a)  

• cells
• organs
• systems
• molecules

Your heart is one of your most important _________________ .

• organs

• muscles

• bones

• nerves

The tissue that forms protective barriers is called ________________ tissue.

• protective

• connective

• muscle

• nervous

Blood, bone, and fat are all (a)   tissues.

• connective
• epithelial
• muscle
• nervous

Body systems are made up of different _________________.

• components

• colors

• shapes

• sounds

Every organ in the body has a special job, or (a)  

• function
• location
• color
• size

The digestive and excretory ________________ process your food and waste.

Organs are made up of ____________.

• tissues

• functions

• nervous

• cells