This article analyzes the relationship between the structure and function of human tissues from the point of view of histology and biochemistry. Four main types of tissues are considered - epithelial, connective, muscle and nervous - in terms of their morphological structure and molecular mechanisms of functioning. Particular attention is paid to how the features of the cellular composition, intercellular substance and specialized structures ensure the performance of biological functions of tissues. Key biochemical processes underlying tissue activity are also analyzed, including protein synthesis, energy metabolism and intercellular signaling. The analysis allows for a deeper understanding of the principles of tissue functioning and their importance for the body's homeostasis.