What are the four main tissue types?

• A. Bone, Cartilage, Blood, Adipose
• B. Endocrine, Exocrine, Nervous, Muscular
• C. Epithelial, Muscle, Blood, Nerve
• D. Muscle, Nervous, Connective, Epithelial

Answer: (D)

The four main tissue types are epithelial, connective, muscle, and nervous. Each type has a distinct role: epithelial tissue lines and protects surfaces and can form glands; connective tissue provides support and binding, including bone, cartilage, blood, and fat; muscle tissue contracts to enable movement; and nervous tissue conducts electrical signals and coordinates body activities. The correct answer includes all four categories, recognizing that these four groups together make up the basic tissue framework of most animals. Other options mix subtypes or misclassify tissues (for example, listing only connective tissue components or combining glandular tissues with neural/muscular tissue), which doesn’t represent the complete set of fundamental tissue types.