Most diseases originate outside our bodies and come to us through a medium from somewhere else. It is important to know from where such diseases come and how they make the transfer possible. Without this knowledge the nurse can not protect her patient from further sickness even if she nurses him to recovery once. The lack of such knowledge also makes it impossible for her to protect herself from the attack of a disease. The sciences of microbiology and pathology teach her all about how diseases breed and how they facilitate their transfer from one body to another and also from one part of the same body to another part.
Important processes like digestion and respiration make life possible. Remove them and the life is removed. Not only that any deficiency in them has a corresponding effect on the health of the body. The knowledge of such processes, and the ways in which they affect the body are important for the nurse to know so that she is able to perform her duties to the best of her capability. She is given the knowledge through the study of subjects like chemistry.
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