What structure is made of different tissues working together to do a job?

• A. Tissue
• B. Organ
• C. System
• D. Gland

Answer: (B)

Different tissues coming together to perform a function describes an organ. Tissues—epithelial, connective, muscle, and nervous—combine in a specific arrangement to form an organ with a particular job. The heart is a classic example: muscle tissue contracts to pump, connective tissue provides support, nervous tissue coordinates timing, and epithelial tissue lines the chambers. This coordinated mix lets the organ carry out its function. A system is a group of organs working together, and a gland is a specialized type of organ that secretes substances, while a tissue is just one type of tissue. So the structure described is an organ.