Connective tissue – consists of cells and a large amount of intercellular substance. Blood is a type of connective tissue consisting of a liquid intercellular substance – plasma and cells – blood cells: erythrocytes (red cells), leukocytes (white cells) and platelets (platelets). Blood plasma is a yellowish translucent liquid containing 90–92% water, as well as mineral and organic substances, hormones, vitamins, amino acids, and metabolic products.
One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.