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The average human body contains over 75 trillion cells , but many life forms exist as single cells that perform all the functions necessary for independent existence . The e-mail addresses will be utilized to advise students of policy changes , scholarship opportunities , announcement of School related events , etc. Employment during Nursing Program : The nursing program permits students to be enrolled full-time or part-time . Cell and Virus Structure - Although the human body contains over 75 trillion cells , the majority of life forms exist as single cells that perform all the functions necessary for independent existence . Plant Cells - The basic plant cell has a similar construction to the animal cell , but does not have centrioles , lysosomes , cilia , or flagella . Confocal Microscopy Digital Image Gallery - Scroll through serial optical sections from a wide variety of specimens , including tissue culture cells , thin and thick sections , and entire organisms , in this Java-powered image gallery . Cell Digestion and the Secretory Pathway - The primary sites of intracellular digestion are organelles known as the lysosomes , which are membrane-bounded compartments containing a variety of hydrolytic enzymes . His findings have been used in a variety of contexts , as we shall see below . Although the human body contains over 75 trillion cells , the majority of life forms exist as single cells that perform all the functions necessary for independent existence . Many compounds are showing great promise as disease fighters in the body , boosting production or activities of enzymes , which then act by blocking carcinogens , suppressing malignant cells , or interfering with the processes that can cause heart disease and stroke .