This article provides a structural-functional analysis of the histological architecture of the blood and cardiovascular system based on IMRAD requirements. The morphological characteristics of blood as a specialized connective tissue, the functions of its formed elements (erythrocytes, leukocytes, platelets), and the histological structure of the blood vessel wall layers (tunica intima, media, adventitia) are described in detail. Furthermore, the mechanisms of interaction between blood and tissue are explained using the example of the microcirculatory bed and the air-blood barrier in the respiratory system. In conclusion, this analysis serves to foster a cellular-level understanding of cardiovascular pathologies and the development of modern clinical thinking among medical students.

Histology, cardiovascular system, connective tissue, erythrocyte, leukocyte, microcirculatory bed, endothelium, air-blood barrier.

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