Blood is a solid connective tissue made up of cellular elements and a fluid extracellular matrix.

Blood is classified as a liquid connective tissue, not a solid connective tissue. Like all connective tissues, it consists of cellular elements (erythrocytes, leukocytes, and platelets) embedded in an extracellular matrix, but that matrix is the liquid plasma rather than a gel, fiber, or mineralized solid substance. The distinction between liquid and solid connective tissue is fundamental: solid connective tissues — such as bone, cartilage, and dense fibrous tissue — have a firm or rigid matrix, whereas blood's matrix remains fluid at body temperature, allowing it to circulate continuously through the cardiovascular system. Because the statement calls blood a 'solid' connective tissue, it is factually incorrect. Students sometimes confuse the broader connective tissue classification with the physical state of the tissue; the key point is that 'connective' refers to origin and function, not consistency. Remembering that blood flows freely through vessels should reinforce that its matrix is liquid, making the statement false.