(1) The human body is made of trillions of cells. Cells are the basic unit of all living things. Each cell is surrounded by the cell membrane. This membrane holds the cell together and controls what goes into and out of the cell. The nucleus is the control center of the cell and contains the DNA. The cytoplasm is the jellylike fluid outside of the nucleus where other parts or organelles of the cell are located. Each type of cell performs a specific job. For example, red blood cells carry oxygen to all parts of the body while the white blood cells work to fight infections. Groups of cells that work together are called tissue.

When taking notes from the above passage, what would be the best paraphrase of the information in Section 1?