Which of the following is NOT a primary type of tissue in the human body?

In the context of the primary types of tissue in the human body, hematologic is not considered a primary tissue type. The human body comprises four primary types of tissue: epithelial, connective, muscle, and nervous tissues. Epithelial tissue serves as a protective barrier and is involved in absorption and secretion. Connective tissue supports and binds other tissues and organs, providing strength and elasticity. While blood is indeed a fluid connective tissue, the category of hematologic is more specific and refers to blood and blood-forming tissues; it does not classify as a primary tissue type in the same way that epithelial, connective, muscle, and nervous tissues do.

Understanding that hematologic refers to specific components of blood further clarifies why it is not recognized as a primary tissue in the same way the fundamental types are.