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These technical advances enabled Matthias Jakob Schleiden and Theodor Schwann to recognize in 1838–39 that the cell is the fundamental unit of organization in all living things.
This connects health, medicine, and science in a way that studies how the human body acquaints itself to physical activity, stress, and diseases.
The field of cytology, which is the study of cells, and that of histology, which is the study of tissue organization from the cellular level up, both arose in the 19th century with the data and techniques of microscopic anatomy as their basis.
Human physiology is the scientific study of the chemistry and physics of the structures of the body and the ways in which they work together to support the functions of life.
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