What are the four main categories of tissues?

The four main categories of tissues in the human body are Epithelial, Connective, Muscle, and Nervous. Epithelial tissue serves as a protective barrier and is involved in absorption and secretion, lining organs and cavities. Connective tissue supports, binds, and protects other tissues and organs; it includes a variety of subtypes like bone, blood, and adipose tissue. Muscle tissue is responsible for movement and can be further divided into skeletal, cardiac, and smooth muscle types. Nervous tissue is essential for transmitting impulses and processing information in the nervous system.

The other options include combinations of tissues that do not reflect the four primary categories recognized in anatomy and histology. For instance, while skeletal and blood are types of connective tissue, they do not represent separate categories on their own, making those options misleading.