Create a 5 pages page paper that discusses cells, tissues, organs and organ systems. A tissue is a collection of cells that may have the same structure to perform a particular function. An organ consists of different tissues that work together to perform a function. An organ system is a higher unit of life that coordinates various organs to drive an important life process. The structure and appearance of the cell and the tissue can be used to differentiate the two. A cell is seen to have a defined outer cover called the plasma membrane. On the other hand, a tissue, organ, and organ system have no defined outer covering layers. (Starr et al. 2013).

The Circulatory system is an example of an organ system and includes different organs such as the heart, and lungs. A heart is an organ that differs from the circulatory system by being a smaller unit of the larger circulatory system. Blood tissue is formed by many cells of different structures. These cells include white blood cells, red blood cells, and platelets. These cells are differentiated to perform specific functions. is an organ that has tissues such as the cardiac muscle, connective tissue, nervous tissue all of which work together to accomplish the task of pumping the blood. (Starr et al. 2013).

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The Cardiovascular system is made up of the blood vessels and the heart. (Rosdahl & Kowalski 2008 ). There are two main types of blood vessels namely. veins and arteries. Veins carry deoxygenated blood under low pressure, except the pulmonary vein. The arteries carry blood under high pressure hence have thick muscles and a narrow lumen to sustain the pressure of the blood. The role of the heart is to propel the blood containing oxygen to different parts of the body and also receive blood deficiency of oxygen from different parts of the body. The heart is a muscular organ with myogenic muscles that contract and relax continuously throughout the life of an organism. The heart is surrounded by a pericardium layer that protects it. The heart is fractioned into the left and right sides by a muscular wall called the septum. Blood on the two sides does not mix.

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