The human body consists of many different organs and organ systems, which
             are made up of billions of cells. Inside these cells there are "tiny
             organsâ€",or organelles. These organelles act in many ways like the organs and
             systems of the body. To better understand the relationship between them, I
             am going to compare and contrast their differences and their similarities.
             The brain is the control center of the human body. It sends and receives
             messages to the rest of the body. The brain is made up of many different
             parts, and each part has its own job. The nucleus of a cell is very similar
             to the brain because it is the control center of the cell. It too sends and
             receives messages, only throughout the cell. The nucleus is made up of many
             all have special jobs also. The brain and nucleus are alike in several ways,
             but contrast in one primary area. The brain sends messages by neurons and
             electric impulses, while the nucleus does it by means of messenger RNA.
             The body has a shape that is contributed to by the muscular and skeletal
             systems. Bones provide the body with framework, and the muscles allow
             movement. The cell has similar organelles, the cytoplasm and the
             microtubules, which provide the cell with form. The microtubules are
             tube-like structures that act like bones do in humans, they give shape and
             support to the cell. The cytoplasm is a jelly-like substance that keeps
             movement of organelles in the cell. The main difference between them is the
             fact that microtubules aren't joined by anything like a ligament or a tendon
             and cytoplasm doesn't contract like muscles do.
             The digestive system of the human body is made up of several organs that
             work together to break down food so it can be used in the body. Similar
             organelles in the cell are endoplasmic reticulum, ribosomes, and the golgi
             body. Endoplasmic reticulum is used in the
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