Cell Structures & Organ Systems

3. organ system that takes oxygen into the body and expels carbon dioxide
4. central structure that controls all activities of the cell.; contains the DNA
5. system of organs that controls the body through chemical messengers called hormones
9. a living thing made of cells
10. organ system involved in creating a new organism
12. Gel-like fluid that protects organelles and provides cell shape.
13. Rigid layer that helps protect and support a plant cell; gives it a shape.
15. system of organs and tissues that controls and coordinates the body's activities
17. a group of organs that work together to do a specific job
18. organ system that transports substances through the body
19. Involuntary actions that keep conditions inside the body such as temperature at a constant
21. Thin layer that forms the outside boundary of the cell and controls what enters and exits the cell.
23. organ system that breaks down food into substances that the body can use, and helps with the absorption of these substances

1. Organ system consisting of the skin and associated organs such as glands and nails; protects internal structures.
2. Powerhouse of the cell, organelle that converts the glucose in food to energy.
6. organ system that enables movement of the body and circulation
7. a structure made of two or more tissues that performs a specific function
8. Organelles that store water, nutrients, and other materials in both plant and animal cells; become large and fill with water to provide support to plant cells.
11. organ system involved in removal of waste products from the body
12. An organelle found in plant and algae cells where photosynthesis occurs
14. the basic unit of structure and function in living things
16. organ system that works to protect the body from disease
20. organ system that provides support for the body through an internal framework
22. a structure made of a group of cells that work together to do a specific job